Add orchestral sampled instruments

daw-backend/src/audio/node_graph/nodes/multi_sampler.rs

@@ -231,7 +231,7 @@ impl Voice {
             envelope_phase: EnvelopePhase::Attack,
             envelope_value: 0.0,
             crossfade_buffer: Vec::new(),
-            crossfade_length: 1000,  // ~20ms at 48kHz (longer for smoother loops)
+            crossfade_length: 4800,  // ~100ms at 48kHz — hides loop seams in sustained instruments
         }
     }
 }

lightningbeam-ui/lightningbeam-editor/Cargo.toml

@@ -79,6 +79,8 @@ assets = [
     ["assets/icons/32x32.png", "usr/share/icons/hicolor/32x32/apps/lightningbeam-editor.png", "644"],
     ["assets/icons/128x128.png", "usr/share/icons/hicolor/128x128/apps/lightningbeam-editor.png", "644"],
     ["assets/icons/256x256.png", "usr/share/icons/hicolor/256x256/apps/lightningbeam-editor.png", "644"],
+    # Factory instrument presets and samples — copied to share dir, preserving directory tree
+    ["target/release/presets/**/*", "usr/share/lightningbeam-editor/presets/", "644"],
 ]
 
 [package.metadata.generate-rpm]
@@ -121,3 +123,10 @@ mode = "644"
 source = "assets/icons/256x256.png"
 dest = "/usr/share/icons/hicolor/256x256/apps/lightningbeam-editor.png"
 mode = "644"
+
+# Factory instrument presets and samples (built by build.rs into target dir)
+[[package.metadata.generate-rpm.assets]]
+source = "target/release/presets/"
+dest = "/usr/share/lightningbeam-editor/presets/"
+mode = "644"
+doc = false

lightningbeam-ui/lightningbeam-editor/build.rs

@@ -5,6 +5,9 @@ use std::path::PathBuf;
 fn main() {
     let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap();
 
+    // Copy factory instrument presets next to the binary (works on all platforms)
+    bundle_factory_presets();
+
     if target_os == "windows" {
         bundle_windows_dlls();
     }
@@ -128,6 +131,56 @@ fn bundle_windows_dlls() {
     println!("cargo:warning=Bundled FFmpeg DLLs to {}", target_dir.display());
 }
 
+/// Copy factory instrument presets into target dir so they're next to the binary.
+/// This makes them available for:
+/// - Portable/AppImage builds (preset browser checks <exe>/presets/)
+/// - Windows builds (same)
+/// - cargo-deb/rpm packaging (assets reference target/release/presets/)
+fn bundle_factory_presets() {
+    let manifest_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
+    let instruments_src = manifest_dir.join("../../src/assets/instruments");
+
+    let out_dir = env::var("OUT_DIR").unwrap();
+    let target_dir = PathBuf::from(&out_dir)
+        .parent().unwrap()
+        .parent().unwrap()
+        .parent().unwrap()
+        .to_path_buf();
+    let presets_dst = target_dir.join("presets");
+
+    if !instruments_src.exists() {
+        println!("cargo:warning=Factory instruments not found at {:?}, skipping", instruments_src);
+        return;
+    }
+
+    // Re-run if instruments change
+    println!("cargo:rerun-if-changed={}", instruments_src.display());
+
+    if let Err(e) = copy_dir_recursive(&instruments_src, &presets_dst) {
+        println!("cargo:warning=Failed to copy factory presets: {}", e);
+    }
+}
+
+/// Recursively copy a directory tree, preserving structure.
+/// Only copies .json and .mp3 files (skips README.md, etc.)
+fn copy_dir_recursive(src: &std::path::Path, dst: &std::path::Path) -> std::io::Result<()> {
+    fs::create_dir_all(dst)?;
+    for entry in fs::read_dir(src)? {
+        let entry = entry?;
+        let src_path = entry.path();
+        let dst_path = dst.join(entry.file_name());
+        if src_path.is_dir() {
+            copy_dir_recursive(&src_path, &dst_path)?;
+        } else if let Some(ext) = src_path.extension() {
+            let ext = ext.to_string_lossy().to_lowercase();
+            if ext == "json" || ext == "mp3" {
+                fs::copy(&src_path, &dst_path)?;
+            }
+        }
+    }
+    Ok(())
+}
+
 fn copy_library(lib_name: &str, search_paths: &[&str], lib_dir: &PathBuf) {
     let mut copied = false;
 

scripts/build_instruments.py

@@ -0,0 +1,569 @@
+#!/usr/bin/env python3
+"""Build factory instrument presets from Virtual Playing Orchestra 3 samples.
+
+Usage:
+    python3 scripts/build_instruments.py
+
+Converts WAV samples to MP3 and generates MultiSampler JSON presets.
+"""
+
+import json
+import os
+import re
+import subprocess
+import sys
+from pathlib import Path
+
+VPO = Path.home() / "Downloads" / "Virtual-Playing-Orchestra3" / "libs"
+INSTRUMENTS_DIR = Path(__file__).parent.parent / "src" / "assets" / "instruments"
+
+# Note name to semitone offset (within octave)
+NOTE_MAP = {
+    'c': 0, 'c#': 1, 'db': 1, 'd': 2, 'd#': 3, 'eb': 3,
+    'e': 4, 'f': 5, 'f#': 6, 'gb': 6, 'g': 7, 'g#': 8, 'ab': 8,
+    'a': 9, 'a#': 10, 'bb': 10, 'b': 11,
+}
+
+
+def note_to_midi(note_name: str, octave: int) -> int:
+    """Convert note name + octave to MIDI number. C4 = 60."""
+    semitone = NOTE_MAP[note_name.lower()]
+    return (octave + 1) * 12 + semitone
+
+
+def parse_sso_filename(filename: str) -> dict | None:
+    """Parse SSO-style: instrument-sus-note-PB-loop.wav (e.g. 1st-violins-sus-a#3.wav)
+    Also handles flats: oboe-a#3, basses-sus-d#2, etc.
+    """
+    m = re.search(r'([a-g][#b]?)(\d+)', filename.lower())
+    if not m:
+        return None
+    note, octave = m.group(1), int(m.group(2))
+    midi = note_to_midi(note, octave)
+    return {'midi': midi, 'note': f"{note.upper()}{octave}"}
+
+
+def parse_nbo_filename(filename: str) -> dict | None:
+    """Parse NBO-style: octave_note.wav (e.g. 3_Bb-PB-loop.wav)"""
+    m = re.match(r'(\d+)_([A-Ga-g][b#]?)', filename)
+    if not m:
+        return None
+    octave, note = int(m.group(1)), m.group(2)
+    midi = note_to_midi(note, octave)
+    return {'midi': midi, 'note': f"{note}{octave}"}
+
+
+def parse_nbo_with_dynamics(filename: str) -> dict | None:
+    """Parse NBO2-style with dynamics: octave_note_p.wav or octave_note.wav"""
+    m = re.match(r'(\d+)_([A-Ga-g][b#]?)(?:_(p|f|mf|ff))?', filename)
+    if not m:
+        return None
+    octave, note = int(m.group(1)), m.group(2)
+    dynamic = m.group(3)
+    midi = note_to_midi(note, octave)
+    return {'midi': midi, 'note': f"{note}{octave}", 'dynamic': dynamic}
+
+
+def parse_mw_viola_filename(filename: str) -> dict | None:
+    """Parse MW-style: Violas_note.wav (e.g. Violas_c4.wav, Violas_d#3.wav)"""
+    m = re.search(r'_([a-g][#b]?)(\d+)\.wav', filename.lower())
+    if not m:
+        return None
+    note, octave = m.group(1), int(m.group(2))
+    midi = note_to_midi(note, octave)
+    return {'midi': midi, 'note': f"{note.upper()}{octave}"}
+
+
+def parse_mw_horn_filename(filename: str) -> dict | None:
+    """Parse MW horn: horns-sus-ff-note-PB-loop.wav or horns-sus-mp-note-PB-loop.wav"""
+    # Extract dynamics marker (ff, mp) from filename
+    dyn_match = re.search(r'-(ff|mp|mf|p|pp)-', filename.lower())
+    dynamic = dyn_match.group(1) if dyn_match else None
+    # Extract note
+    m = re.search(r'([a-g][#b]?)(\d+)', filename.lower())
+    if not m:
+        return None
+    note, octave = m.group(1), int(m.group(2))
+    midi = note_to_midi(note, octave)
+    return {'midi': midi, 'note': f"{note.upper()}{octave}", 'dynamic': dynamic}
+
+
+def parse_vsco_harp_filename(filename: str) -> dict | None:
+    """Parse VSCO harp: KSHarp_Note_dyn.wav (e.g. KSHarp_A4_mf.wav)"""
+    m = re.search(r'KSHarp_([A-G][b#]?)(\d+)', filename)
+    if not m:
+        return None
+    note, octave = m.group(1), int(m.group(2))
+    midi = note_to_midi(note, octave)
+    return {'midi': midi, 'note': f"{note}{octave}"}
+
+
+def convert_wav_to_mp3(wav_path: Path, mp3_path: Path, bitrate: str = '192k'):
+    """Convert WAV to MP3 using ffmpeg with peak normalization."""
+    mp3_path.parent.mkdir(parents=True, exist_ok=True)
+    if mp3_path.exists():
+        return  # Skip if already converted
+    # Peak-normalize to -1dBFS so all samples have consistent max level.
+    # Using dynaudnorm with very gentle settings to avoid changing the
+    # character of the sound — just brings everything to the same peak level.
+    subprocess.run([
+        'ffmpeg', '-i', str(wav_path),
+        '-af', 'loudnorm=I=-16:TP=-1:LRA=11',
+        '-ar', '44100', '-ab', bitrate,
+        '-y', '-loglevel', 'error',
+        str(mp3_path)
+    ], check=True)
+
+
+def compute_key_ranges(layers: list[dict]) -> list[dict]:
+    """Compute key_min/key_max for each layer by splitting at midpoints between adjacent root notes."""
+    if not layers:
+        return layers
+    layers.sort(key=lambda l: l['root_key'])
+    for i, layer in enumerate(layers):
+        if i == 0:
+            layer['key_min'] = 0
+        else:
+            midpoint = (layers[i-1]['root_key'] + layer['root_key']) // 2 + 1
+            layer['key_min'] = midpoint
+            layers[i-1]['key_max'] = midpoint - 1
+        if i == len(layers) - 1:
+            layer['key_max'] = 127
+    return layers
+
+
+def make_preset(name: str, description: str, tags: list[str], layers: list[dict],
+                attack: float = 0.01, release: float = 0.3) -> dict:
+    """Generate a complete instrument preset JSON."""
+    return {
+        "metadata": {
+            "name": name,
+            "description": description,
+            "author": "Virtual Playing Orchestra 3",
+            "version": 1,
+            "tags": tags
+        },
+        "midi_targets": [0],
+        "output_node": 2,
+        "nodes": [
+            {
+                "id": 0,
+                "node_type": "MidiInput",
+                "name": "MIDI In",
+                "parameters": {},
+                "position": [100.0, 100.0]
+            },
+            {
+                "id": 1,
+                "node_type": "MultiSampler",
+                "name": f"{name} Sampler",
+                "parameters": {
+                    "0": 1.0,      # gain
+                    "1": attack,   # attack
+                    "2": release,  # release
+                    "3": 0.0       # transpose
+                },
+                "sample_data": {
+                    "type": "multi_sampler",
+                    "layers": layers
+                },
+                "position": [350.0, 0.0]
+            },
+            {
+                "id": 2,
+                "node_type": "AudioOutput",
+                "name": "Out",
+                "parameters": {},
+                "position": [700.0, 100.0]
+            }
+        ],
+        "connections": [
+            {"from_node": 0, "from_port": 0, "to_node": 1, "to_port": 0},
+            {"from_node": 1, "from_port": 0, "to_node": 2, "to_port": 0}
+        ]
+    }
+
+
+def build_simple_instrument(name: str, description: str, tags: list[str],
+                            source_dir: Path, output_subdir: str,
+                            filename_filter=None, parser=parse_sso_filename,
+                            attack: float = 0.01, release: float = 0.3,
+                            loop: bool = False):
+    """Build a single-velocity instrument from a directory of WAV files."""
+    out_dir = INSTRUMENTS_DIR / output_subdir
+    samples_dir = out_dir / "samples"
+    samples_dir.mkdir(parents=True, exist_ok=True)
+
+    layers = []
+    wav_files = sorted(source_dir.glob("*.wav"))
+    for wav in wav_files:
+        if filename_filter and not filename_filter(wav.name):
+            continue
+        parsed = parser(wav.name)
+        if not parsed:
+            print(f"  WARNING: Could not parse {wav.name}, skipping")
+            continue
+        mp3_name = f"{parsed['note']}.mp3"
+        mp3_path = samples_dir / mp3_name
+        print(f"  Converting {wav.name} -> {mp3_name} (MIDI {parsed['midi']})")
+        convert_wav_to_mp3(wav, mp3_path)
+        layer = {
+            "file_path": f"samples/{mp3_name}",
+            "root_key": parsed['midi'],
+            "velocity_min": 0,
+            "velocity_max": 127,
+        }
+        if loop:
+            layer["loop_mode"] = "continuous"
+        layers.append(layer)
+
+    layers = compute_key_ranges(layers)
+    preset = make_preset(name, description, tags, layers, attack, release)
+    preset_path = out_dir / f"{output_subdir.split('/')[-1]}.json"
+    with open(preset_path, 'w') as f:
+        json.dump(preset, f, indent=2)
+    print(f"  -> Wrote {preset_path} ({len(layers)} layers)")
+    return layers
+
+
+def build_dynamics_instrument(name: str, description: str, tags: list[str],
+                              source_dir: Path, output_subdir: str,
+                              filename_filter=None, parser=parse_nbo_with_dynamics,
+                              attack: float = 0.01, release: float = 0.3,
+                              loop: bool = False):
+    """Build an instrument with velocity layers from dynamics markings."""
+    out_dir = INSTRUMENTS_DIR / output_subdir
+    samples_dir = out_dir / "samples"
+    samples_dir.mkdir(parents=True, exist_ok=True)
+
+    # Group samples by dynamics level
+    # Map dynamics markings to velocity ranges (soft to loud)
+    DYNAMICS_ORDER = ['pp', 'p', 'mp', 'mf', 'f', 'ff']
+    dynamics_groups: dict[str | None, list[dict]] = {}
+
+    wav_files = sorted(source_dir.glob("*.wav"))
+    for wav in wav_files:
+        if filename_filter and not filename_filter(wav.name):
+            continue
+        parsed = parser(wav.name)
+        if not parsed:
+            print(f"  WARNING: Could not parse {wav.name}, skipping")
+            continue
+        dyn = parsed.get('dynamic')
+        suffix = f"_{dyn}" if dyn else ""
+        mp3_name = f"{parsed['note']}{suffix}.mp3"
+        mp3_path = samples_dir / mp3_name
+        print(f"  Converting {wav.name} -> {mp3_name} (MIDI {parsed['midi']}, dyn={dyn})")
+        convert_wav_to_mp3(wav, mp3_path)
+
+        layer = {
+            "file_path": f"samples/{mp3_name}",
+            "root_key": parsed['midi'],
+        }
+        if loop:
+            layer["loop_mode"] = "continuous"
+        dynamics_groups.setdefault(dyn, []).append(layer)
+
+    # Determine velocity ranges based on how many dynamics levels exist
+    # Treat None (unmarked) as forte — it's the "normal" dynamic
+    dyn_keys = sorted(dynamics_groups.keys(),
+                      key=lambda d: DYNAMICS_ORDER.index(d) if d and d in DYNAMICS_ORDER else
+                      (DYNAMICS_ORDER.index('f') if d is None else 3))
+    if len(dyn_keys) == 1:
+        # Only one dynamics level — full velocity
+        for layer in dynamics_groups[dyn_keys[0]]:
+            layer["velocity_min"] = 0
+            layer["velocity_max"] = 127
+    else:
+        num_levels = len(dyn_keys)
+        vel_step = 128 // num_levels
+        for i, dyn in enumerate(dyn_keys):
+            vel_min = i * vel_step
+            vel_max = (i + 1) * vel_step - 1 if i < num_levels - 1 else 127
+            for layer in dynamics_groups[dyn]:
+                layer["velocity_min"] = vel_min
+                layer["velocity_max"] = vel_max
+
+    # Compute key ranges separately for each velocity group
+    all_layers = []
+    for dyn, group in dynamics_groups.items():
+        group = compute_key_ranges(group)
+        all_layers.extend(group)
+    preset = make_preset(name, description, tags, all_layers, attack, release)
+    preset_path = out_dir / f"{output_subdir.split('/')[-1]}.json"
+    with open(preset_path, 'w') as f:
+        json.dump(preset, f, indent=2)
+    dyn_summary = ", ".join(f"{k or 'default'}: {len(v)}" for k, v in dynamics_groups.items())
+    print(f"  -> Wrote {preset_path} ({len(all_layers)} layers: {dyn_summary})")
+    return all_layers
+
+
+def build_combined_instrument(name: str, description: str, tags: list[str],
+                              component_dirs: list[str], output_subdir: str,
+                              attack: float = 0.01, release: float = 0.3):
+    """Build a combined instrument that references samples from component instruments.
+
+    component_dirs: list of output_subdir paths for component instruments, ordered low to high pitch.
+    Splits the keyboard range across them.
+    """
+    out_dir = INSTRUMENTS_DIR / output_subdir
+    out_dir.mkdir(parents=True, exist_ok=True)
+
+    # Load each component's preset to get its layers
+    all_component_layers = []
+    for comp_dir in component_dirs:
+        comp_path = INSTRUMENTS_DIR / comp_dir
+        json_files = list(comp_path.glob("*.json"))
+        if not json_files:
+            print(f"  WARNING: No preset found in {comp_dir}")
+            continue
+        with open(json_files[0]) as f:
+            comp_preset = json.load(f)
+        comp_layers = comp_preset["nodes"][1]["sample_data"]["layers"]
+        # Adjust file paths to be relative from the combined instrument dir
+        rel_prefix = os.path.relpath(comp_path, out_dir)
+        for layer in comp_layers:
+            layer["file_path"] = f"{rel_prefix}/{layer['file_path']}"
+        all_component_layers.extend(comp_layers)
+
+    # Re-sort by root key and recompute ranges across all layers
+    # Group by velocity range to handle dynamics separately
+    vel_groups = {}
+    for layer in all_component_layers:
+        vel_key = (layer["velocity_min"], layer["velocity_max"])
+        vel_groups.setdefault(vel_key, []).append(layer)
+
+    final_layers = []
+    for vel_key, group in vel_groups.items():
+        group = compute_key_ranges(group)
+        # Preserve the original velocity range
+        for layer in group:
+            layer["velocity_min"] = vel_key[0]
+            layer["velocity_max"] = vel_key[1]
+        final_layers.extend(group)
+
+    preset = make_preset(name, description, tags, final_layers, attack, release)
+    preset_path = out_dir / f"{output_subdir.split('/')[-1]}.json"
+    with open(preset_path, 'w') as f:
+        json.dump(preset, f, indent=2)
+    print(f"  -> Wrote {preset_path} ({len(final_layers)} layers from {len(component_dirs)} components)")
+
+
+def main():
+    print("=== Building Lightningbeam Factory Instruments from VPO3 ===\n")
+
+    if not VPO.exists():
+        print(f"ERROR: VPO3 not found at {VPO}")
+        sys.exit(1)
+
+    # --- STRINGS ---
+
+    print("\n[1/14] Violin Section (SSO 1st Violins sustain)")
+    build_simple_instrument(
+        "Violin Section", "Orchestral violin section with sustained bowing",
+        ["strings", "violin", "section", "orchestral"],
+        VPO / "SSO" / "Samples" / "1st Violins",
+        "strings/violin-section",
+        filename_filter=lambda f: 'sus' in f.lower(),
+        parser=parse_sso_filename,
+        attack=0.05, release=0.4,
+        loop=True,
+    )
+
+    print("\n[2/14] Viola Section (Mattias-Westlund)")
+    build_simple_instrument(
+        "Viola Section", "Orchestral viola section with sustained bowing",
+        ["strings", "viola", "section", "orchestral"],
+        VPO / "Mattias-Westlund" / "ViolaSect" / "Samples",
+        "strings/viola-section",
+        parser=parse_mw_viola_filename,
+        attack=0.05, release=0.4,
+        loop=True,
+    )
+
+    print("\n[3/14] Cello Section (NBO sustain)")
+    build_simple_instrument(
+        "Cello Section", "Orchestral cello section with sustained bowing",
+        ["strings", "cello", "section", "orchestral"],
+        VPO / "NoBudgetOrch" / "CelloSect" / "Sustain",
+        "strings/cello-section",
+        parser=parse_nbo_filename,
+        attack=0.05, release=0.4,
+        loop=True,
+    )
+
+    print("\n[4/14] Bass Section (SSO sustain)")
+    build_simple_instrument(
+        "Bass Section", "Orchestral double bass section with sustained bowing",
+        ["strings", "bass", "contrabass", "section", "orchestral"],
+        VPO / "SSO" / "Samples" / "Basses",
+        "strings/bass-section",
+        filename_filter=lambda f: 'sus' in f.lower(),
+        parser=parse_sso_filename,
+        attack=0.08, release=0.5,
+        loop=True,
+    )
+
+    print("\n[5/14] Harp (VSCO2-CE)")
+    build_simple_instrument(
+        "Harp", "Concert harp",
+        ["strings", "harp", "orchestral"],
+        VPO / "VSCO2-CE" / "Strings" / "Harp",
+        "strings/harp",
+        parser=parse_vsco_harp_filename,
+        attack=0.001, release=0.8,
+    )
+
+    # --- WOODWINDS ---
+
+    print("\n[6/14] Flute Section (NBO)")
+    build_simple_instrument(
+        "Flute", "Orchestral flute section",
+        ["woodwinds", "flute", "section", "orchestral"],
+        VPO / "NoBudgetOrch" / "FluteSect",
+        "woodwinds/flute",
+        parser=parse_nbo_filename,
+        attack=0.03, release=0.3,
+        loop=True,
+    )
+
+    print("\n[7/14] Oboe (SSO solo)")
+    build_simple_instrument(
+        "Oboe", "Solo oboe",
+        ["woodwinds", "oboe", "solo", "orchestral"],
+        VPO / "SSO" / "Samples" / "Oboe",
+        "woodwinds/oboe",
+        filename_filter=lambda f: f.endswith('.wav') and 'readme' not in f.lower(),
+        parser=parse_sso_filename,
+        attack=0.02, release=0.25,
+        loop=True,
+    )
+
+    print("\n[8/14] Clarinet Section (NBO)")
+    build_simple_instrument(
+        "Clarinet", "Orchestral clarinet section",
+        ["woodwinds", "clarinet", "section", "orchestral"],
+        VPO / "NoBudgetOrch" / "ClarinetSect" / "Sustain",
+        "woodwinds/clarinet",
+        parser=parse_nbo_filename,
+        attack=0.02, release=0.25,
+        loop=True,
+    )
+
+    print("\n[9/14] Bassoon (SSO)")
+    build_simple_instrument(
+        "Bassoon", "Solo bassoon",
+        ["woodwinds", "bassoon", "solo", "orchestral"],
+        VPO / "SSO" / "Samples" / "Bassoon",
+        "woodwinds/bassoon",
+        parser=parse_sso_filename,
+        attack=0.03, release=0.3,
+        loop=True,
+    )
+
+    # --- BRASS ---
+
+    print("\n[10/14] Horn Section (Mattias-Westlund, ff + mp dynamics)")
+    build_dynamics_instrument(
+        "Horn Section", "French horn section with forte and mezzo-piano dynamics",
+        ["brass", "horn", "french horn", "section", "orchestral"],
+        VPO / "Mattias-Westlund" / "Horns" / "Samples",
+        "brass/horn-section",
+        parser=parse_mw_horn_filename,
+        attack=0.04, release=0.4,
+        loop=True,
+    )
+
+    print("\n[11/14] Trumpet Section (NBO2 with dynamics)")
+    build_dynamics_instrument(
+        "Trumpet Section", "Orchestral trumpet section with piano and forte dynamics",
+        ["brass", "trumpet", "section", "orchestral"],
+        VPO / "NoBudgetOrch2" / "Trumpet" / "TrumpetSect" / "Sustain",
+        "brass/trumpet-section",
+        attack=0.02, release=0.3,
+        loop=True,
+    )
+
+    print("\n[12/14] Trombone Section (NBO2 with dynamics)")
+    build_dynamics_instrument(
+        "Trombone Section", "Orchestral trombone section with piano and forte dynamics",
+        ["brass", "trombone", "section", "orchestral"],
+        VPO / "NoBudgetOrch2" / "Trombone" / "TromboneSect" / "Sustain",
+        "brass/trombone-section",
+        attack=0.03, release=0.35,
+        loop=True,
+    )
+
+    print("\n[13/14] Tuba (SSO sustain)")
+    build_simple_instrument(
+        "Tuba", "Orchestral tuba",
+        ["brass", "tuba", "orchestral"],
+        VPO / "SSO" / "Samples" / "Tuba",
+        "brass/tuba",
+        filename_filter=lambda f: 'sus' in f.lower(),
+        parser=parse_sso_filename,
+        attack=0.04, release=0.4,
+        loop=True,
+    )
+
+    # --- PERCUSSION ---
+
+    print("\n[14/14] Timpani (NBO)")
+    build_simple_instrument(
+        "Timpani", "Orchestral timpani",
+        ["percussion", "timpani", "orchestral"],
+        VPO / "NoBudgetOrch" / "Timpani",
+        "orchestral/timpani",
+        parser=lambda f: parse_sso_filename(f),  # Note-octave format like A2-PB.wav
+        attack=0.001, release=1.5,
+    )
+
+    # --- COMBINED INSTRUMENTS ---
+
+    print("\n[Combined] Strings")
+    build_combined_instrument(
+        "Strings", "Full string section — auto-selects violin, viola, cello, or bass by pitch range",
+        ["strings", "section", "orchestral", "combined"],
+        [
+            "strings/bass-section",
+            "strings/cello-section",
+            "strings/viola-section",
+            "strings/violin-section",
+        ],
+        "strings/strings-combined",
+        attack=0.05, release=0.4,
+    )
+
+    print("\n[Combined] Woodwinds")
+    build_combined_instrument(
+        "Woodwinds", "Full woodwind section — auto-selects bassoon, clarinet, oboe, or flute by pitch range",
+        ["woodwinds", "section", "orchestral", "combined"],
+        [
+            "woodwinds/bassoon",
+            "woodwinds/clarinet",
+            "woodwinds/oboe",
+            "woodwinds/flute",
+        ],
+        "woodwinds/woodwinds-combined",
+        attack=0.03, release=0.3,
+    )
+
+    print("\n[Combined] Brass")
+    build_combined_instrument(
+        "Brass", "Full brass section — auto-selects tuba, trombone, horn, or trumpet by pitch range",
+        ["brass", "section", "orchestral", "combined"],
+        [
+            "brass/tuba",
+            "brass/trombone-section",
+            "brass/horn-section",
+            "brass/trumpet-section",
+        ],
+        "brass/brass-combined",
+        attack=0.03, release=0.35,
+    )
+
+    print("\n=== Done! ===")
+
+
+if __name__ == '__main__':
+    main()

src/assets/instruments/brass/brass-combined/brass-combined.json

@@ -0,0 +1,758 @@
+{
+  "metadata": {
+    "name": "Brass",
+    "description": "Full brass section \u2014 auto-selects tuba, trombone, horn, or trumpet by pitch range",
+    "author": "Virtual Playing Orchestra 3",
+    "version": 1,
+    "tags": [
+      "brass",
+      "section",
+      "orchestral",
+      "combined"
+    ]
+  },
+  "midi_targets": [
+    0
+  ],
+  "output_node": 2,
+  "nodes": [
+    {
+      "id": 0,
+      "node_type": "MidiInput",
+      "name": "MIDI In",
+      "parameters": {},
+      "position": [
+        100.0,
+        100.0
+      ]
+    },
+    {
+      "id": 1,
+      "node_type": "MultiSampler",
+      "name": "Brass Sampler",
+      "parameters": {
+        "0": 1.0,
+        "1": 0.03,
+        "2": 0.35,
+        "3": 0.0
+      },
+      "sample_data": {
+        "type": "multi_sampler",
+        "layers": [
+          {
+            "file_path": "../tuba/samples/E1.mp3",
+            "root_key": 28,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 0,
+            "key_max": 29
+          },
+          {
+            "file_path": "../tuba/samples/G1.mp3",
+            "root_key": 31,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 30,
+            "key_max": 32
+          },
+          {
+            "file_path": "../tuba/samples/A#1.mp3",
+            "root_key": 34,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 33,
+            "key_max": 35
+          },
+          {
+            "file_path": "../tuba/samples/C#2.mp3",
+            "root_key": 37,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 36,
+            "key_max": 38
+          },
+          {
+            "file_path": "../tuba/samples/E2.mp3",
+            "root_key": 40,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 39,
+            "key_max": 41
+          },
+          {
+            "file_path": "../tuba/samples/G2.mp3",
+            "root_key": 43,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 42,
+            "key_max": 44
+          },
+          {
+            "file_path": "../tuba/samples/A#2.mp3",
+            "root_key": 46,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 45,
+            "key_max": 47
+          },
+          {
+            "file_path": "../tuba/samples/C#3.mp3",
+            "root_key": 49,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 48,
+            "key_max": 50
+          },
+          {
+            "file_path": "../tuba/samples/E3.mp3",
+            "root_key": 52,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 51,
+            "key_max": 127
+          },
+          {
+            "file_path": "../horn-section/samples/E2_ff.mp3",
+            "root_key": 40,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 0,
+            "key_max": 40
+          },
+          {
+            "file_path": "../trombone-section/samples/F2.mp3",
+            "root_key": 41,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 41,
+            "key_max": 42
+          },
+          {
+            "file_path": "../horn-section/samples/G2_ff.mp3",
+            "root_key": 43,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 43,
+            "key_max": 44
+          },
+          {
+            "file_path": "../trombone-section/samples/A2.mp3",
+            "root_key": 45,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 45,
+            "key_max": 45
+          },
+          {
+            "file_path": "../horn-section/samples/A#2_ff.mp3",
+            "root_key": 46,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 46,
+            "key_max": 47
+          },
+          {
+            "file_path": "../trombone-section/samples/C3.mp3",
+            "root_key": 48,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 48,
+            "key_max": 48
+          },
+          {
+            "file_path": "../horn-section/samples/C#3_ff.mp3",
+            "root_key": 49,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 49,
+            "key_max": 50
+          },
+          {
+            "file_path": "../trombone-section/samples/Eb3.mp3",
+            "root_key": 51,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 51,
+            "key_max": 51
+          },
+          {
+            "file_path": "../horn-section/samples/E3_ff.mp3",
+            "root_key": 52,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 52,
+            "key_max": 53
+          },
+          {
+            "file_path": "../trombone-section/samples/Gb3.mp3",
+            "root_key": 54,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 54,
+            "key_max": 54
+          },
+          {
+            "file_path": "../horn-section/samples/G3_ff.mp3",
+            "root_key": 55,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 55,
+            "key_max": 55
+          },
+          {
+            "file_path": "../trumpet-section/samples/G3.mp3",
+            "root_key": 55,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 56,
+            "key_max": 55
+          },
+          {
+            "file_path": "../trumpet-section/samples/Ab3.mp3",
+            "root_key": 56,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 56,
+            "key_max": 56
+          },
+          {
+            "file_path": "../trombone-section/samples/A3.mp3",
+            "root_key": 57,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 57,
+            "key_max": 57
+          },
+          {
+            "file_path": "../horn-section/samples/A#3_ff.mp3",
+            "root_key": 58,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 58,
+            "key_max": 58
+          },
+          {
+            "file_path": "../trumpet-section/samples/Bb3.mp3",
+            "root_key": 58,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 59,
+            "key_max": 59
+          },
+          {
+            "file_path": "../trombone-section/samples/C4.mp3",
+            "root_key": 60,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 60,
+            "key_max": 60
+          },
+          {
+            "file_path": "../trumpet-section/samples/C4.mp3",
+            "root_key": 60,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 61,
+            "key_max": 60
+          },
+          {
+            "file_path": "../horn-section/samples/C#4_ff.mp3",
+            "root_key": 61,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 61,
+            "key_max": 61
+          },
+          {
+            "file_path": "../trumpet-section/samples/D4.mp3",
+            "root_key": 62,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 62,
+            "key_max": 62
+          },
+          {
+            "file_path": "../trombone-section/samples/Eb4.mp3",
+            "root_key": 63,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 63,
+            "key_max": 63
+          },
+          {
+            "file_path": "../horn-section/samples/E4_ff.mp3",
+            "root_key": 64,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 64,
+            "key_max": 64
+          },
+          {
+            "file_path": "../trumpet-section/samples/E4.mp3",
+            "root_key": 64,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 65,
+            "key_max": 64
+          },
+          {
+            "file_path": "../trumpet-section/samples/F4.mp3",
+            "root_key": 65,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 65,
+            "key_max": 65
+          },
+          {
+            "file_path": "../trombone-section/samples/Gb4.mp3",
+            "root_key": 66,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 66,
+            "key_max": 66
+          },
+          {
+            "file_path": "../horn-section/samples/G4_ff.mp3",
+            "root_key": 67,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 67,
+            "key_max": 67
+          },
+          {
+            "file_path": "../trumpet-section/samples/G4.mp3",
+            "root_key": 67,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 68,
+            "key_max": 68
+          },
+          {
+            "file_path": "../trombone-section/samples/A4.mp3",
+            "root_key": 69,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 69,
+            "key_max": 69
+          },
+          {
+            "file_path": "../trumpet-section/samples/A4.mp3",
+            "root_key": 69,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 70,
+            "key_max": 69
+          },
+          {
+            "file_path": "../horn-section/samples/A#4_ff.mp3",
+            "root_key": 70,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 70,
+            "key_max": 70
+          },
+          {
+            "file_path": "../trumpet-section/samples/Bb4.mp3",
+            "root_key": 70,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 71,
+            "key_max": 71
+          },
+          {
+            "file_path": "../trombone-section/samples/C5.mp3",
+            "root_key": 72,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 72,
+            "key_max": 72
+          },
+          {
+            "file_path": "../trumpet-section/samples/C5.mp3",
+            "root_key": 72,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 73,
+            "key_max": 72
+          },
+          {
+            "file_path": "../horn-section/samples/C#5_ff.mp3",
+            "root_key": 73,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 73,
+            "key_max": 73
+          },
+          {
+            "file_path": "../trumpet-section/samples/D5.mp3",
+            "root_key": 74,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 74,
+            "key_max": 74
+          },
+          {
+            "file_path": "../trumpet-section/samples/Eb5.mp3",
+            "root_key": 75,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 75,
+            "key_max": 75
+          },
+          {
+            "file_path": "../horn-section/samples/E5_ff.mp3",
+            "root_key": 76,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 76,
+            "key_max": 76
+          },
+          {
+            "file_path": "../trumpet-section/samples/F5.mp3",
+            "root_key": 77,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 77,
+            "key_max": 78
+          },
+          {
+            "file_path": "../trumpet-section/samples/G5.mp3",
+            "root_key": 79,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 79,
+            "key_max": 80
+          },
+          {
+            "file_path": "../trumpet-section/samples/A5.mp3",
+            "root_key": 81,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 81,
+            "key_max": 82
+          },
+          {
+            "file_path": "../trumpet-section/samples/B5.mp3",
+            "root_key": 83,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 83,
+            "key_max": 84
+          },
+          {
+            "file_path": "../trumpet-section/samples/Db6.mp3",
+            "root_key": 85,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 85,
+            "key_max": 127
+          },
+          {
+            "file_path": "../horn-section/samples/E2_mp.mp3",
+            "root_key": 40,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 0,
+            "key_max": 40
+          },
+          {
+            "file_path": "../trombone-section/samples/F2_p.mp3",
+            "root_key": 41,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 41,
+            "key_max": 42
+          },
+          {
+            "file_path": "../horn-section/samples/G2_mp.mp3",
+            "root_key": 43,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 43,
+            "key_max": 44
+          },
+          {
+            "file_path": "../trombone-section/samples/Bb2_p.mp3",
+            "root_key": 46,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 45,
+            "key_max": 46
+          },
+          {
+            "file_path": "../horn-section/samples/A#2_mp.mp3",
+            "root_key": 46,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 47,
+            "key_max": 47
+          },
+          {
+            "file_path": "../horn-section/samples/C#3_mp.mp3",
+            "root_key": 49,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 48,
+            "key_max": 50
+          },
+          {
+            "file_path": "../trombone-section/samples/Eb3_p.mp3",
+            "root_key": 51,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 51,
+            "key_max": 51
+          },
+          {
+            "file_path": "../horn-section/samples/E3_mp.mp3",
+            "root_key": 52,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 52,
+            "key_max": 53
+          },
+          {
+            "file_path": "../horn-section/samples/G3_mp.mp3",
+            "root_key": 55,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 54,
+            "key_max": 55
+          },
+          {
+            "file_path": "../trombone-section/samples/Ab3_p.mp3",
+            "root_key": 56,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 56,
+            "key_max": 57
+          },
+          {
+            "file_path": "../horn-section/samples/A#3_mp.mp3",
+            "root_key": 58,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 58,
+            "key_max": 58
+          },
+          {
+            "file_path": "../trumpet-section/samples/Bb3_p.mp3",
+            "root_key": 58,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 59,
+            "key_max": 59
+          },
+          {
+            "file_path": "../trombone-section/samples/Db4_p.mp3",
+            "root_key": 61,
+            "loop_mode": "continuous",
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+            "velocity_max": 63,
+            "key_min": 60,
+            "key_max": 61
+          },
+          {
+            "file_path": "../horn-section/samples/C#4_mp.mp3",
+            "root_key": 61,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 62,
+            "key_max": 62
+          },
+          {
+            "file_path": "../trumpet-section/samples/Eb4_p.mp3",
+            "root_key": 63,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 63,
+            "key_max": 63
+          },
+          {
+            "file_path": "../horn-section/samples/E4_mp.mp3",
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+            "velocity_max": 63,
+            "key_min": 64,
+            "key_max": 65
+          },
+          {
+            "file_path": "../trombone-section/samples/Gb4_p.mp3",
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+            "loop_mode": "continuous",
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+            "velocity_max": 63,
+            "key_min": 66,
+            "key_max": 66
+          },
+          {
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+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 67,
+            "key_max": 67
+          },
+          {
+            "file_path": "../trumpet-section/samples/Ab4_p.mp3",
+            "root_key": 68,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 68,
+            "key_max": 69
+          },
+          {
+            "file_path": "../horn-section/samples/A#4_mp.mp3",
+            "root_key": 70,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 70,
+            "key_max": 70
+          },
+          {
+            "file_path": "../trombone-section/samples/B4_p.mp3",
+            "root_key": 71,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 71,
+            "key_max": 72
+          },
+          {
+            "file_path": "../horn-section/samples/C#5_mp.mp3",
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+            "loop_mode": "continuous",
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+            "velocity_max": 63,
+            "key_min": 73,
+            "key_max": 73
+          },
+          {
+            "file_path": "../trumpet-section/samples/Db5_p.mp3",
+            "root_key": 73,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 74,
+            "key_max": 74
+          },
+          {
+            "file_path": "../horn-section/samples/E5_mp.mp3",
+            "root_key": 76,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 75,
+            "key_max": 78
+          },
+          {
+            "file_path": "../trumpet-section/samples/Ab5_p.mp3",
+            "root_key": 80,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 79,
+            "key_max": 127
+          }
+        ]
+      },
+      "position": [
+        350.0,
+        0.0
+      ]
+    },
+    {
+      "id": 2,
+      "node_type": "AudioOutput",
+      "name": "Out",
+      "parameters": {},
+      "position": [
+        700.0,
+        100.0
+      ]
+    }
+  ],
+  "connections": [
+    {
+      "from_node": 0,
+      "from_port": 0,
+      "to_node": 1,
+      "to_port": 0
+    },
+    {
+      "from_node": 1,
+      "from_port": 0,
+      "to_node": 2,
+      "to_port": 0
+    }
+  ]
+}

src/assets/instruments/brass/horn-section/horn-section.json

@@ -0,0 +1,309 @@
+{
+  "metadata": {
+    "name": "Horn Section",
+    "description": "French horn section with forte and mezzo-piano dynamics",
+    "author": "Virtual Playing Orchestra 3",
+    "version": 1,
+    "tags": [
+      "brass",
+      "horn",
+      "french horn",
+      "section",
+      "orchestral"
+    ]
+  },
+  "midi_targets": [
+    0
+  ],
+  "output_node": 2,
+  "nodes": [
+    {
+      "id": 0,
+      "node_type": "MidiInput",
+      "name": "MIDI In",
+      "parameters": {},
+      "position": [
+        100.0,
+        100.0
+      ]
+    },
+    {
+      "id": 1,
+      "node_type": "MultiSampler",
+      "name": "Horn Section Sampler",
+      "parameters": {
+        "0": 1.0,
+        "1": 0.04,
+        "2": 0.4,
+        "3": 0.0
+      },
+      "sample_data": {
+        "type": "multi_sampler",
+        "layers": [
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+            "root_key": 40,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 0,
+            "key_max": 41
+          },
+          {
+            "file_path": "samples/G2_ff.mp3",
+            "root_key": 43,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 42,
+            "key_max": 44
+          },
+          {
+            "file_path": "samples/A#2_ff.mp3",
+            "root_key": 46,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 45,
+            "key_max": 47
+          },
+          {
+            "file_path": "samples/C#3_ff.mp3",
+            "root_key": 49,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 48,
+            "key_max": 50
+          },
+          {
+            "file_path": "samples/E3_ff.mp3",
+            "root_key": 52,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 51,
+            "key_max": 53
+          },
+          {
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+            "loop_mode": "continuous",
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+            "velocity_max": 127,
+            "key_min": 54,
+            "key_max": 56
+          },
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+            "velocity_max": 127,
+            "key_min": 57,
+            "key_max": 59
+          },
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+            "loop_mode": "continuous",
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+            "velocity_max": 127,
+            "key_min": 60,
+            "key_max": 62
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+            "velocity_max": 127,
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+            "root_key": 67,
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+            "velocity_max": 127,
+            "key_min": 66,
+            "key_max": 68
+          },
+          {
+            "file_path": "samples/A#4_ff.mp3",
+            "root_key": 70,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 69,
+            "key_max": 71
+          },
+          {
+            "file_path": "samples/C#5_ff.mp3",
+            "root_key": 73,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 72,
+            "key_max": 74
+          },
+          {
+            "file_path": "samples/E5_ff.mp3",
+            "root_key": 76,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 75,
+            "key_max": 127
+          },
+          {
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+            "root_key": 40,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 0,
+            "key_max": 41
+          },
+          {
+            "file_path": "samples/G2_mp.mp3",
+            "root_key": 43,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 42,
+            "key_max": 44
+          },
+          {
+            "file_path": "samples/A#2_mp.mp3",
+            "root_key": 46,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 45,
+            "key_max": 47
+          },
+          {
+            "file_path": "samples/C#3_mp.mp3",
+            "root_key": 49,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 48,
+            "key_max": 50
+          },
+          {
+            "file_path": "samples/E3_mp.mp3",
+            "root_key": 52,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 51,
+            "key_max": 53
+          },
+          {
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+            "root_key": 55,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 54,
+            "key_max": 56
+          },
+          {
+            "file_path": "samples/A#3_mp.mp3",
+            "root_key": 58,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 57,
+            "key_max": 59
+          },
+          {
+            "file_path": "samples/C#4_mp.mp3",
+            "root_key": 61,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 60,
+            "key_max": 62
+          },
+          {
+            "file_path": "samples/E4_mp.mp3",
+            "root_key": 64,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 63,
+            "key_max": 65
+          },
+          {
+            "file_path": "samples/G4_mp.mp3",
+            "root_key": 67,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 66,
+            "key_max": 68
+          },
+          {
+            "file_path": "samples/A#4_mp.mp3",
+            "root_key": 70,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 69,
+            "key_max": 71
+          },
+          {
+            "file_path": "samples/C#5_mp.mp3",
+            "root_key": 73,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 72,
+            "key_max": 74
+          },
+          {
+            "file_path": "samples/E5_mp.mp3",
+            "root_key": 76,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 75,
+            "key_max": 127
+          }
+        ]
+      },
+      "position": [
+        350.0,
+        0.0
+      ]
+    },
+    {
+      "id": 2,
+      "node_type": "AudioOutput",
+      "name": "Out",
+      "parameters": {},
+      "position": [
+        700.0,
+        100.0
+      ]
+    }
+  ],
+  "connections": [
+    {
+      "from_node": 0,
+      "from_port": 0,
+      "to_node": 1,
+      "to_port": 0
+    },
+    {
+      "from_node": 1,
+      "from_port": 0,
+      "to_node": 2,
+      "to_port": 0
+    }
+  ]
+}

src/assets/instruments/brass/trombone-section/trombone-section.json

@@ -0,0 +1,236 @@
+{
+  "metadata": {
+    "name": "Trombone Section",
+    "description": "Orchestral trombone section with piano and forte dynamics",
+    "author": "Virtual Playing Orchestra 3",
+    "version": 1,
+    "tags": [
+      "brass",
+      "trombone",
+      "section",
+      "orchestral"
+    ]
+  },
+  "midi_targets": [
+    0
+  ],
+  "output_node": 2,
+  "nodes": [
+    {
+      "id": 0,
+      "node_type": "MidiInput",
+      "name": "MIDI In",
+      "parameters": {},
+      "position": [
+        100.0,
+        100.0
+      ]
+    },
+    {
+      "id": 1,
+      "node_type": "MultiSampler",
+      "name": "Trombone Section Sampler",
+      "parameters": {
+        "0": 1.0,
+        "1": 0.03,
+        "2": 0.35,
+        "3": 0.0
+      },
+      "sample_data": {
+        "type": "multi_sampler",
+        "layers": [
+          {
+            "file_path": "samples/F2.mp3",
+            "root_key": 41,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 0,
+            "key_max": 43
+          },
+          {
+            "file_path": "samples/A2.mp3",
+            "root_key": 45,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 44,
+            "key_max": 46
+          },
+          {
+            "file_path": "samples/C3.mp3",
+            "root_key": 48,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 47,
+            "key_max": 49
+          },
+          {
+            "file_path": "samples/Eb3.mp3",
+            "root_key": 51,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 50,
+            "key_max": 52
+          },
+          {
+            "file_path": "samples/Gb3.mp3",
+            "root_key": 54,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 53,
+            "key_max": 55
+          },
+          {
+            "file_path": "samples/A3.mp3",
+            "root_key": 57,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 56,
+            "key_max": 58
+          },
+          {
+            "file_path": "samples/C4.mp3",
+            "root_key": 60,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 59,
+            "key_max": 61
+          },
+          {
+            "file_path": "samples/Eb4.mp3",
+            "root_key": 63,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 62,
+            "key_max": 64
+          },
+          {
+            "file_path": "samples/Gb4.mp3",
+            "root_key": 66,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 65,
+            "key_max": 67
+          },
+          {
+            "file_path": "samples/A4.mp3",
+            "root_key": 69,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 68,
+            "key_max": 70
+          },
+          {
+            "file_path": "samples/C5.mp3",
+            "root_key": 72,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 71,
+            "key_max": 127
+          },
+          {
+            "file_path": "samples/F2_p.mp3",
+            "root_key": 41,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 0,
+            "key_max": 43
+          },
+          {
+            "file_path": "samples/Bb2_p.mp3",
+            "root_key": 46,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 44,
+            "key_max": 48
+          },
+          {
+            "file_path": "samples/Eb3_p.mp3",
+            "root_key": 51,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 49,
+            "key_max": 53
+          },
+          {
+            "file_path": "samples/Ab3_p.mp3",
+            "root_key": 56,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 54,
+            "key_max": 58
+          },
+          {
+            "file_path": "samples/Db4_p.mp3",
+            "root_key": 61,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 59,
+            "key_max": 63
+          },
+          {
+            "file_path": "samples/Gb4_p.mp3",
+            "root_key": 66,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 64,
+            "key_max": 68
+          },
+          {
+            "file_path": "samples/B4_p.mp3",
+            "root_key": 71,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 69,
+            "key_max": 127
+          }
+        ]
+      },
+      "position": [
+        350.0,
+        0.0
+      ]
+    },
+    {
+      "id": 2,
+      "node_type": "AudioOutput",
+      "name": "Out",
+      "parameters": {},
+      "position": [
+        700.0,
+        100.0
+      ]
+    }
+  ],
+  "connections": [
+    {
+      "from_node": 0,
+      "from_port": 0,
+      "to_node": 1,
+      "to_port": 0
+    },
+    {
+      "from_node": 1,
+      "from_port": 0,
+      "to_node": 2,
+      "to_port": 0
+    }
+  ]
+}

src/assets/instruments/brass/trumpet-section/trumpet-section.json

@@ -0,0 +1,281 @@
+{
+  "metadata": {
+    "name": "Trumpet Section",
+    "description": "Orchestral trumpet section with piano and forte dynamics",
+    "author": "Virtual Playing Orchestra 3",
+    "version": 1,
+    "tags": [
+      "brass",
+      "trumpet",
+      "section",
+      "orchestral"
+    ]
+  },
+  "midi_targets": [
+    0
+  ],
+  "output_node": 2,
+  "nodes": [
+    {
+      "id": 0,
+      "node_type": "MidiInput",
+      "name": "MIDI In",
+      "parameters": {},
+      "position": [
+        100.0,
+        100.0
+      ]
+    },
+    {
+      "id": 1,
+      "node_type": "MultiSampler",
+      "name": "Trumpet Section Sampler",
+      "parameters": {
+        "0": 1.0,
+        "1": 0.02,
+        "2": 0.3,
+        "3": 0.0
+      },
+      "sample_data": {
+        "type": "multi_sampler",
+        "layers": [
+          {
+            "file_path": "samples/G3.mp3",
+            "root_key": 55,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 0,
+            "key_max": 55
+          },
+          {
+            "file_path": "samples/Ab3.mp3",
+            "root_key": 56,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 56,
+            "key_max": 57
+          },
+          {
+            "file_path": "samples/Bb3.mp3",
+            "root_key": 58,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 58,
+            "key_max": 59
+          },
+          {
+            "file_path": "samples/C4.mp3",
+            "root_key": 60,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 60,
+            "key_max": 61
+          },
+          {
+            "file_path": "samples/D4.mp3",
+            "root_key": 62,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 62,
+            "key_max": 63
+          },
+          {
+            "file_path": "samples/E4.mp3",
+            "root_key": 64,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 64,
+            "key_max": 64
+          },
+          {
+            "file_path": "samples/F4.mp3",
+            "root_key": 65,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 65,
+            "key_max": 66
+          },
+          {
+            "file_path": "samples/G4.mp3",
+            "root_key": 67,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 67,
+            "key_max": 68
+          },
+          {
+            "file_path": "samples/A4.mp3",
+            "root_key": 69,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 69,
+            "key_max": 69
+          },
+          {
+            "file_path": "samples/Bb4.mp3",
+            "root_key": 70,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 70,
+            "key_max": 71
+          },
+          {
+            "file_path": "samples/C5.mp3",
+            "root_key": 72,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 72,
+            "key_max": 73
+          },
+          {
+            "file_path": "samples/D5.mp3",
+            "root_key": 74,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 74,
+            "key_max": 74
+          },
+          {
+            "file_path": "samples/Eb5.mp3",
+            "root_key": 75,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 75,
+            "key_max": 76
+          },
+          {
+            "file_path": "samples/F5.mp3",
+            "root_key": 77,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 77,
+            "key_max": 78
+          },
+          {
+            "file_path": "samples/G5.mp3",
+            "root_key": 79,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 79,
+            "key_max": 80
+          },
+          {
+            "file_path": "samples/A5.mp3",
+            "root_key": 81,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 81,
+            "key_max": 82
+          },
+          {
+            "file_path": "samples/B5.mp3",
+            "root_key": 83,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 83,
+            "key_max": 84
+          },
+          {
+            "file_path": "samples/Db6.mp3",
+            "root_key": 85,
+            "loop_mode": "continuous",
+            "velocity_min": 64,
+            "velocity_max": 127,
+            "key_min": 85,
+            "key_max": 127
+          },
+          {
+            "file_path": "samples/Bb3_p.mp3",
+            "root_key": 58,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 0,
+            "key_max": 60
+          },
+          {
+            "file_path": "samples/Eb4_p.mp3",
+            "root_key": 63,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 61,
+            "key_max": 65
+          },
+          {
+            "file_path": "samples/Ab4_p.mp3",
+            "root_key": 68,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 66,
+            "key_max": 70
+          },
+          {
+            "file_path": "samples/Db5_p.mp3",
+            "root_key": 73,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 71,
+            "key_max": 76
+          },
+          {
+            "file_path": "samples/Ab5_p.mp3",
+            "root_key": 80,
+            "loop_mode": "continuous",
+            "velocity_min": 0,
+            "velocity_max": 63,
+            "key_min": 77,
+            "key_max": 127
+          }
+        ]
+      },
+      "position": [
+        350.0,
+        0.0
+      ]
+    },
+    {
+      "id": 2,
+      "node_type": "AudioOutput",
+      "name": "Out",
+      "parameters": {},
+      "position": [
+        700.0,
+        100.0
+      ]
+    }
+  ],
+  "connections": [
+    {
+      "from_node": 0,
+      "from_port": 0,
+      "to_node": 1,
+      "to_port": 0
+    },
+    {
+      "from_node": 1,
+      "from_port": 0,
+      "to_node": 2,
+      "to_port": 0
+    }
+  ]
+}

src/assets/instruments/brass/tuba/tuba.json

@@ -0,0 +1,154 @@
+{
+  "metadata": {
+    "name": "Tuba",
+    "description": "Orchestral tuba",
+    "author": "Virtual Playing Orchestra 3",
+    "version": 1,
+    "tags": [
+      "brass",
+      "tuba",
+      "orchestral"
+    ]
+  },
+  "midi_targets": [
+    0
+  ],
+  "output_node": 2,
+  "nodes": [
+    {
+      "id": 0,
+      "node_type": "MidiInput",
+      "name": "MIDI In",
+      "parameters": {},
+      "position": [
+        100.0,
+        100.0
+      ]
+    },
+    {
+      "id": 1,
+      "node_type": "MultiSampler",
+      "name": "Tuba Sampler",
+      "parameters": {
+        "0": 1.0,
+        "1": 0.04,
+        "2": 0.4,
+        "3": 0.0
+      },
+      "sample_data": {
+        "type": "multi_sampler",
+        "layers": [
+          {
+            "file_path": "samples/E1.mp3",
+            "root_key": 28,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 0,
+            "key_max": 29
+          },
+          {
+            "file_path": "samples/G1.mp3",
+            "root_key": 31,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 30,
+            "key_max": 32
+          },
+          {
+            "file_path": "samples/A#1.mp3",
+            "root_key": 34,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 33,
+            "key_max": 35
+          },
+          {
+            "file_path": "samples/C#2.mp3",
+            "root_key": 37,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 36,
+            "key_max": 38
+          },
+          {
+            "file_path": "samples/E2.mp3",
+            "root_key": 40,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 39,
+            "key_max": 41
+          },
+          {
+            "file_path": "samples/G2.mp3",
+            "root_key": 43,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 42,
+            "key_max": 44
+          },
+          {
+            "file_path": "samples/A#2.mp3",
+            "root_key": 46,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 45,
+            "key_max": 47
+          },
+          {
+            "file_path": "samples/C#3.mp3",
+            "root_key": 49,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 48,
+            "key_max": 50
+          },
+          {
+            "file_path": "samples/E3.mp3",
+            "root_key": 52,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "loop_mode": "continuous",
+            "key_min": 51,
+            "key_max": 127
+          }
+        ]
+      },
+      "position": [
+        350.0,
+        0.0
+      ]
+    },
+    {
+      "id": 2,
+      "node_type": "AudioOutput",
+      "name": "Out",
+      "parameters": {},
+      "position": [
+        700.0,
+        100.0
+      ]
+    }
+  ],
+  "connections": [
+    {
+      "from_node": 0,
+      "from_port": 0,
+      "to_node": 1,
+      "to_port": 0
+    },
+    {
+      "from_node": 1,
+      "from_port": 0,
+      "to_node": 2,
+      "to_port": 0
+    }
+  ]
+}

src/assets/instruments/orchestral/timpani/timpani.json

@@ -0,0 +1,185 @@
+{
+  "metadata": {
+    "name": "Timpani",
+    "description": "Orchestral timpani",
+    "author": "Virtual Playing Orchestra 3",
+    "version": 1,
+    "tags": [
+      "percussion",
+      "timpani",
+      "orchestral"
+    ]
+  },
+  "midi_targets": [
+    0
+  ],
+  "output_node": 2,
+  "nodes": [
+    {
+      "id": 0,
+      "node_type": "MidiInput",
+      "name": "MIDI In",
+      "parameters": {},
+      "position": [
+        100.0,
+        100.0
+      ]
+    },
+    {
+      "id": 1,
+      "node_type": "MultiSampler",
+      "name": "Timpani Sampler",
+      "parameters": {
+        "0": 1.0,
+        "1": 0.001,
+        "2": 1.5,
+        "3": 0.0
+      },
+      "sample_data": {
+        "type": "multi_sampler",
+        "layers": [
+          {
+            "file_path": "samples/C2.mp3",
+            "root_key": 36,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "key_min": 0,
+            "key_max": 37
+          },
+          {
+            "file_path": "samples/D2.mp3",
+            "root_key": 38,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "key_min": 38,
+            "key_max": 39
+          },
+          {
+            "file_path": "samples/E2.mp3",
+            "root_key": 40,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "key_min": 40,
+            "key_max": 40
+          },
+          {
+            "file_path": "samples/F2.mp3",
+            "root_key": 41,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "key_min": 41,
+            "key_max": 42
+          },
+          {
+            "file_path": "samples/AB2.mp3",
+            "root_key": 44,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "key_min": 43,
+            "key_max": 44
+          },
+          {
+            "file_path": "samples/A2.mp3",
+            "root_key": 45,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "key_min": 45,
+            "key_max": 45
+          },
+          {
+            "file_path": "samples/BB2.mp3",
+            "root_key": 46,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "key_min": 46,
+            "key_max": 47
+          },
+          {
+            "file_path": "samples/C3.mp3",
+            "root_key": 48,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "key_min": 48,
+            "key_max": 49
+          },
+          {
+            "file_path": "samples/D3.mp3",
+            "root_key": 50,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "key_min": 50,
+            "key_max": 52
+          },
+          {
+            "file_path": "samples/GB3.mp3",
+            "root_key": 54,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "key_min": 53,
+            "key_max": 54
+          },
+          {
+            "file_path": "samples/G3.mp3",
+            "root_key": 55,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "key_min": 55,
+            "key_max": 55
+          },
+          {
+            "file_path": "samples/AB3.mp3",
+            "root_key": 56,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "key_min": 56,
+            "key_max": 56
+          },
+          {
+            "file_path": "samples/A3.mp3",
+            "root_key": 57,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "key_min": 57,
+            "key_max": 57
+          },
+          {
+            "file_path": "samples/BB3.mp3",
+            "root_key": 58,
+            "velocity_min": 0,
+            "velocity_max": 127,
+            "key_min": 58,
+            "key_max": 127
+          }
+        ]
+      },
+      "position": [
+        350.0,
+        0.0
+      ]
+    },
+    {
+      "id": 2,
+      "node_type": "AudioOutput",
+      "name": "Out",
+      "parameters": {},
+      "position": [
+        700.0,
+        100.0
+      ]
+    }
+  ],
+  "connections": [
+    {
+      "from_node": 0,
+      "from_port": 0,
+      "to_node": 1,
+      "to_port": 0
+    },
+    {
+      "from_node": 1,
+      "from_port": 0,
+      "to_node": 2,
+      "to_port": 0
+    }
+  ]
+}