Add presets and make graph follow selected layer/track

daw-backend/src/audio/engine.rs

@@ -722,7 +722,7 @@ impl Engine {
             }
 
             // Node graph commands
-            Command::GraphAddNode(track_id, node_type, _x, _y) => {
+            Command::GraphAddNode(track_id, node_type, x, y) => {
                 // Get MIDI track (graphs are only for MIDI tracks currently)
                 if let Some(TrackNode::Midi(track)) = self.project.get_track_mut(track_id) {
                     // Create graph if it doesn't exist
@@ -760,6 +760,9 @@ impl Engine {
                         let node_idx = graph.add_node(node);
                         let node_id = node_idx.index() as u32;
 
+                        // Save position
+                        graph.set_node_position(node_idx, x, y);
+
                         // Automatically set MIDI-receiving nodes as MIDI targets
                         if node_type == "MidiInput" || node_type == "VoiceAllocator" {
                             graph.set_midi_target(node_idx, true);
@@ -907,6 +910,72 @@ impl Engine {
                     }
                 }
             }
+
+            Command::GraphSavePreset(track_id, preset_path, preset_name, description, tags) => {
+                if let Some(TrackNode::Midi(track)) = self.project.get_track_mut(track_id) {
+                    if let Some(ref graph) = track.instrument_graph {
+                        // Serialize the graph to a preset
+                        let mut preset = graph.to_preset(&preset_name);
+                        preset.metadata.description = description;
+                        preset.metadata.tags = tags;
+                        preset.metadata.author = String::from("User");
+
+                        // Write to file
+                        if let Ok(json) = preset.to_json() {
+                            if let Err(e) = std::fs::write(&preset_path, json) {
+                                let _ = self.event_tx.push(AudioEvent::GraphConnectionError(
+                                    track_id,
+                                    format!("Failed to save preset: {}", e)
+                                ));
+                            }
+                        } else {
+                            let _ = self.event_tx.push(AudioEvent::GraphConnectionError(
+                                track_id,
+                                "Failed to serialize preset".to_string()
+                            ));
+                        }
+                    }
+                }
+            }
+
+            Command::GraphLoadPreset(track_id, preset_path) => {
+                // Read and deserialize the preset
+                match std::fs::read_to_string(&preset_path) {
+                    Ok(json) => {
+                        match crate::audio::node_graph::preset::GraphPreset::from_json(&json) {
+                            Ok(preset) => {
+                                match InstrumentGraph::from_preset(&preset, self.sample_rate, 8192) {
+                                    Ok(graph) => {
+                                        // Replace the track's graph
+                                        if let Some(TrackNode::Midi(track)) = self.project.get_track_mut(track_id) {
+                                            track.instrument_graph = Some(graph);
+                                            let _ = self.event_tx.push(AudioEvent::GraphStateChanged(track_id));
+                                        }
+                                    }
+                                    Err(e) => {
+                                        let _ = self.event_tx.push(AudioEvent::GraphConnectionError(
+                                            track_id,
+                                            format!("Failed to create graph from preset: {}", e)
+                                        ));
+                                    }
+                                }
+                            }
+                            Err(e) => {
+                                let _ = self.event_tx.push(AudioEvent::GraphConnectionError(
+                                    track_id,
+                                    format!("Failed to parse preset: {}", e)
+                                ));
+                            }
+                        }
+                    }
+                    Err(e) => {
+                        let _ = self.event_tx.push(AudioEvent::GraphConnectionError(
+                            track_id,
+                            format!("Failed to read preset file: {}", e)
+                        ));
+                    }
+                }
+            }
         }
     }
 
@@ -1377,4 +1446,14 @@ impl EngineController {
     pub fn graph_set_output_node(&mut self, track_id: TrackId, node_id: u32) {
         let _ = self.command_tx.push(Command::GraphSetOutputNode(track_id, node_id));
     }
+
+    /// Save the current graph as a preset
+    pub fn graph_save_preset(&mut self, track_id: TrackId, preset_path: String, preset_name: String, description: String, tags: Vec<String>) {
+        let _ = self.command_tx.push(Command::GraphSavePreset(track_id, preset_path, preset_name, description, tags));
+    }
+
+    /// Load a preset into a track's graph
+    pub fn graph_load_preset(&mut self, track_id: TrackId, preset_path: String) {
+        let _ = self.command_tx.push(Command::GraphLoadPreset(track_id, preset_path));
+    }
 }

daw-backend/src/audio/node_graph/graph.rs

@@ -78,6 +78,9 @@ pub struct InstrumentGraph {
 
     /// Temporary buffers for node MIDI inputs during processing
     midi_input_buffers: Vec<Vec<MidiEvent>>,
+
+    /// UI positions for nodes (node_index -> (x, y))
+    node_positions: std::collections::HashMap<u32, (f32, f32)>,
 }
 
 impl InstrumentGraph {
@@ -94,6 +97,7 @@ impl InstrumentGraph {
             input_buffers: vec![vec![0.0; buffer_size * 2]; 16],
             // Pre-allocate MIDI input buffers (max 128 events per port)
             midi_input_buffers: (0..16).map(|_| Vec::with_capacity(128)).collect(),
+            node_positions: std::collections::HashMap::new(),
         }
     }
 
@@ -103,6 +107,16 @@ impl InstrumentGraph {
         self.graph.add_node(graph_node)
     }
 
+    /// Set the UI position for a node
+    pub fn set_node_position(&mut self, node: NodeIndex, x: f32, y: f32) {
+        self.node_positions.insert(node.index() as u32, (x, y));
+    }
+
+    /// Get the UI position for a node
+    pub fn get_node_position(&self, node: NodeIndex) -> Option<(f32, f32)> {
+        self.node_positions.get(&(node.index() as u32)).copied()
+    }
+
     /// Connect two nodes with type checking
     pub fn connect(
         &mut self,
@@ -543,4 +557,154 @@ impl InstrumentGraph {
 
         new_graph
     }
+
+    /// Serialize the graph to a preset
+    pub fn to_preset(&self, name: impl Into<String>) -> crate::audio::node_graph::preset::GraphPreset {
+        use crate::audio::node_graph::preset::{GraphPreset, SerializedConnection, SerializedNode};
+        use crate::audio::node_graph::nodes::VoiceAllocatorNode;
+
+        let mut preset = GraphPreset::new(name);
+
+        // Serialize all nodes
+        for node_idx in self.graph.node_indices() {
+            if let Some(graph_node) = self.graph.node_weight(node_idx) {
+                let node = &graph_node.node;
+                let node_id = node_idx.index() as u32;
+
+                let mut serialized = SerializedNode::new(node_id, node.node_type());
+
+                // Get all parameters
+                for param in node.parameters() {
+                    let value = node.get_parameter(param.id);
+                    serialized.set_parameter(param.id, value);
+                }
+
+                // For VoiceAllocator nodes, serialize the template graph
+                // We need to downcast to access template_graph()
+                // This is safe because we know the node type
+                if node.node_type() == "VoiceAllocator" {
+                    // Use Any to downcast
+                    let node_ptr = &**node as *const dyn crate::audio::node_graph::AudioNode;
+                    let node_ptr = node_ptr as *const VoiceAllocatorNode;
+                    unsafe {
+                        let va_node = &*node_ptr;
+                        let template_preset = va_node.template_graph().to_preset("template");
+                        serialized.template_graph = Some(Box::new(template_preset));
+                    }
+                }
+
+                // Save position if available
+                if let Some(pos) = self.get_node_position(node_idx) {
+                    serialized.set_position(pos.0, pos.1);
+                }
+
+                preset.add_node(serialized);
+            }
+        }
+
+        // Serialize connections
+        for edge in self.graph.edge_references() {
+            let source = edge.source();
+            let target = edge.target();
+            let conn = edge.weight();
+
+            preset.add_connection(SerializedConnection {
+                from_node: source.index() as u32,
+                from_port: conn.from_port,
+                to_node: target.index() as u32,
+                to_port: conn.to_port,
+            });
+        }
+
+        // MIDI targets
+        preset.midi_targets = self.midi_targets.iter().map(|idx| idx.index() as u32).collect();
+
+        // Output node
+        preset.output_node = self.output_node.map(|idx| idx.index() as u32);
+
+        preset
+    }
+
+    /// Deserialize a preset into the graph
+    pub fn from_preset(preset: &crate::audio::node_graph::preset::GraphPreset, sample_rate: u32, buffer_size: usize) -> Result<Self, String> {
+        use crate::audio::node_graph::nodes::*;
+        use petgraph::stable_graph::NodeIndex;
+        use std::collections::HashMap;
+
+        let mut graph = Self::new(sample_rate, buffer_size);
+        let mut index_map: HashMap<u32, NodeIndex> = HashMap::new();
+
+        // Create all nodes
+        for serialized_node in &preset.nodes {
+            // Create the node based on type
+            let node: Box<dyn crate::audio::node_graph::AudioNode> = match serialized_node.node_type.as_str() {
+                "Oscillator" => Box::new(OscillatorNode::new("Oscillator")),
+                "Gain" => Box::new(GainNode::new("Gain")),
+                "Mixer" => Box::new(MixerNode::new("Mixer")),
+                "Filter" => Box::new(FilterNode::new("Filter")),
+                "ADSR" => Box::new(ADSRNode::new("ADSR")),
+                "MidiInput" => Box::new(MidiInputNode::new("MIDI Input")),
+                "MidiToCV" => Box::new(MidiToCVNode::new("MIDI→CV")),
+                "AudioToCV" => Box::new(AudioToCVNode::new("Audio→CV")),
+                "Oscilloscope" => Box::new(OscilloscopeNode::new("Oscilloscope")),
+                "TemplateInput" => Box::new(TemplateInputNode::new("Template Input")),
+                "TemplateOutput" => Box::new(TemplateOutputNode::new("Template Output")),
+                "VoiceAllocator" => {
+                    let mut va = VoiceAllocatorNode::new("VoiceAllocator", sample_rate, buffer_size);
+
+                    // If there's a template graph, deserialize and set it
+                    if let Some(ref template_preset) = serialized_node.template_graph {
+                        let template_graph = Self::from_preset(template_preset, sample_rate, buffer_size)?;
+                        // Set the template graph (we'll need to add this method to VoiceAllocator)
+                        *va.template_graph_mut() = template_graph;
+                        va.rebuild_voices();
+                    }
+
+                    Box::new(va)
+                }
+                "AudioOutput" => Box::new(AudioOutputNode::new("Output")),
+                _ => return Err(format!("Unknown node type: {}", serialized_node.node_type)),
+            };
+
+            let node_idx = graph.add_node(node);
+            index_map.insert(serialized_node.id, node_idx);
+
+            // Set parameters
+            for (&param_id, &value) in &serialized_node.parameters {
+                if let Some(graph_node) = graph.graph.node_weight_mut(node_idx) {
+                    graph_node.node.set_parameter(param_id, value);
+                }
+            }
+
+            // Restore position
+            graph.set_node_position(node_idx, serialized_node.position.0, serialized_node.position.1);
+        }
+
+        // Create connections
+        for conn in &preset.connections {
+            let from_idx = index_map.get(&conn.from_node)
+                .ok_or_else(|| format!("Connection from unknown node {}", conn.from_node))?;
+            let to_idx = index_map.get(&conn.to_node)
+                .ok_or_else(|| format!("Connection to unknown node {}", conn.to_node))?;
+
+            graph.connect(*from_idx, conn.from_port, *to_idx, conn.to_port)
+                .map_err(|e| format!("Failed to connect nodes: {:?}", e))?;
+        }
+
+        // Set MIDI targets
+        for &target_id in &preset.midi_targets {
+            if let Some(&target_idx) = index_map.get(&target_id) {
+                graph.set_midi_target(target_idx, true);
+            }
+        }
+
+        // Set output node
+        if let Some(output_id) = preset.output_node {
+            if let Some(&output_idx) = index_map.get(&output_id) {
+                graph.output_node = Some(output_idx);
+            }
+        }
+
+        Ok(graph)
+    }
 }

daw-backend/src/audio/node_graph/mod.rs

@@ -2,7 +2,9 @@ mod graph;
 mod node_trait;
 mod types;
 pub mod nodes;
+pub mod preset;
 
 pub use graph::{Connection, GraphNode, InstrumentGraph};
 pub use node_trait::AudioNode;
+pub use preset::{GraphPreset, PresetMetadata, SerializedConnection, SerializedNode};
 pub use types::{ConnectionError, NodeCategory, NodePort, Parameter, ParameterUnit, SignalType};

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

@@ -102,7 +102,7 @@ impl OscilloscopeNode {
         ];
 
         let parameters = vec![
-            Parameter::new(PARAM_TIME_SCALE, "Time Scale", 10.0, 1000.0, 100.0, ParameterUnit::Milliseconds),
+            Parameter::new(PARAM_TIME_SCALE, "Time Scale", 10.0, 1000.0, 100.0, ParameterUnit::Time),
             Parameter::new(PARAM_TRIGGER_MODE, "Trigger", 0.0, 2.0, 0.0, ParameterUnit::Generic),
             Parameter::new(PARAM_TRIGGER_LEVEL, "Trigger Level", -1.0, 1.0, 0.0, ParameterUnit::Generic),
         ];

daw-backend/src/audio/node_graph/preset.rs

@@ -0,0 +1,147 @@
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+
+/// Serializable representation of a node graph preset
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct GraphPreset {
+    /// Preset metadata
+    pub metadata: PresetMetadata,
+
+    /// Nodes in the graph
+    pub nodes: Vec<SerializedNode>,
+
+    /// Connections between nodes
+    pub connections: Vec<SerializedConnection>,
+
+    /// Which node indices are MIDI targets
+    pub midi_targets: Vec<u32>,
+
+    /// Which node index is the audio output (None if not set)
+    pub output_node: Option<u32>,
+}
+
+/// Metadata about the preset
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct PresetMetadata {
+    /// Preset name
+    pub name: String,
+
+    /// Description of what the preset sounds like
+    #[serde(default)]
+    pub description: String,
+
+    /// Preset author
+    #[serde(default)]
+    pub author: String,
+
+    /// Preset version (for compatibility)
+    #[serde(default = "default_version")]
+    pub version: u32,
+
+    /// Tags for categorization (e.g., "bass", "lead", "pad")
+    #[serde(default)]
+    pub tags: Vec<String>,
+}
+
+fn default_version() -> u32 {
+    1
+}
+
+/// Serialized node representation
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SerializedNode {
+    /// Unique ID (node index in the graph)
+    pub id: u32,
+
+    /// Node type (e.g., "Oscillator", "Filter", "ADSR")
+    pub node_type: String,
+
+    /// Parameter values (param_id -> value)
+    pub parameters: HashMap<u32, f32>,
+
+    /// UI position (for visual editor)
+    #[serde(default)]
+    pub position: (f32, f32),
+
+    /// For VoiceAllocator nodes: the nested template graph
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub template_graph: Option<Box<GraphPreset>>,
+}
+
+/// Serialized connection between nodes
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SerializedConnection {
+    /// Source node ID
+    pub from_node: u32,
+
+    /// Source port index
+    pub from_port: usize,
+
+    /// Destination node ID
+    pub to_node: u32,
+
+    /// Destination port index
+    pub to_port: usize,
+}
+
+impl GraphPreset {
+    /// Create a new preset with the given name
+    pub fn new(name: impl Into<String>) -> Self {
+        Self {
+            metadata: PresetMetadata {
+                name: name.into(),
+                description: String::new(),
+                author: String::new(),
+                version: 1,
+                tags: Vec::new(),
+            },
+            nodes: Vec::new(),
+            connections: Vec::new(),
+            midi_targets: Vec::new(),
+            output_node: None,
+        }
+    }
+
+    /// Serialize to JSON string
+    pub fn to_json(&self) -> Result<String, serde_json::Error> {
+        serde_json::to_string_pretty(self)
+    }
+
+    /// Deserialize from JSON string
+    pub fn from_json(json: &str) -> Result<Self, serde_json::Error> {
+        serde_json::from_str(json)
+    }
+
+    /// Add a node to the preset
+    pub fn add_node(&mut self, node: SerializedNode) {
+        self.nodes.push(node);
+    }
+
+    /// Add a connection to the preset
+    pub fn add_connection(&mut self, connection: SerializedConnection) {
+        self.connections.push(connection);
+    }
+}
+
+impl SerializedNode {
+    /// Create a new serialized node
+    pub fn new(id: u32, node_type: impl Into<String>) -> Self {
+        Self {
+            id,
+            node_type: node_type.into(),
+            parameters: HashMap::new(),
+            position: (0.0, 0.0),
+            template_graph: None,
+        }
+    }
+
+    /// Set a parameter value
+    pub fn set_parameter(&mut self, param_id: u32, value: f32) {
+        self.parameters.insert(param_id, value);
+    }
+
+    /// Set UI position
+    pub fn set_position(&mut self, x: f32, y: f32) {
+        self.position = (x, y);
+    }
+}

daw-backend/src/command/types.rs

@@ -137,6 +137,11 @@ pub enum Command {
     GraphSetMidiTarget(TrackId, u32, bool),
     /// Set which node is the audio output (track_id, node_index)
     GraphSetOutputNode(TrackId, u32),
+
+    /// Save current graph as a preset (track_id, preset_path, preset_name, description, tags)
+    GraphSavePreset(TrackId, String, String, String, Vec<String>),
+    /// Load a preset into a track's graph (track_id, preset_path)
+    GraphLoadPreset(TrackId, String),
 }
 
 /// Events sent from audio thread back to UI/control thread

daw-backend/src/lib.rs

@@ -17,6 +17,7 @@ pub use audio::{
     Metatrack, MidiClip, MidiClipId, MidiEvent, MidiTrack, ParameterId, PoolAudioFile, Project, RecordingState, RenderContext, Track, TrackId,
     TrackNode,
 };
+pub use audio::node_graph::{GraphPreset, InstrumentGraph, PresetMetadata, SerializedConnection, SerializedNode};
 pub use command::{AudioEvent, Command};
 pub use effects::{Effect, GainEffect, PanEffect, SimpleEQ, SimpleSynth};
 pub use io::{load_midi_file, AudioFile, WaveformPeak, WavWriter};

src-tauri/assets/factory_presets/Basic_Sine.json

@@ -0,0 +1,98 @@
+{
+  "metadata": {
+    "name": "Basic Sine",
+    "description": "Simple sine wave synthesizer with ADSR envelope. Great for learning the basics of subtractive synthesis.",
+    "author": "Lightningbeam",
+    "version": 1,
+    "tags": ["basic", "lead", "mono"]
+  },
+  "nodes": [
+    {
+      "id": 0,
+      "node_type": "MidiInput",
+      "parameters": {},
+      "position": [100.0, 200.0]
+    },
+    {
+      "id": 1,
+      "node_type": "MidiToCV",
+      "parameters": {},
+      "position": [300.0, 200.0]
+    },
+    {
+      "id": 2,
+      "node_type": "Oscillator",
+      "parameters": {
+        "0": 440.0,
+        "1": 0.7,
+        "2": 0.0
+      },
+      "position": [500.0, 150.0]
+    },
+    {
+      "id": 3,
+      "node_type": "ADSR",
+      "parameters": {
+        "0": 0.01,
+        "1": 0.1,
+        "2": 0.7,
+        "3": 0.3
+      },
+      "position": [500.0, 300.0]
+    },
+    {
+      "id": 4,
+      "node_type": "Gain",
+      "parameters": {
+        "0": 1.0
+      },
+      "position": [700.0, 200.0]
+    },
+    {
+      "id": 5,
+      "node_type": "AudioOutput",
+      "parameters": {},
+      "position": [900.0, 200.0]
+    }
+  ],
+  "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
+    },
+    {
+      "from_node": 1,
+      "from_port": 1,
+      "to_node": 3,
+      "to_port": 0
+    },
+    {
+      "from_node": 2,
+      "from_port": 0,
+      "to_node": 4,
+      "to_port": 0
+    },
+    {
+      "from_node": 3,
+      "from_port": 0,
+      "to_node": 4,
+      "to_port": 1
+    },
+    {
+      "from_node": 4,
+      "from_port": 0,
+      "to_node": 5,
+      "to_port": 0
+    }
+  ],
+  "midi_targets": [0],
+  "output_node": 5
+}

src-tauri/assets/factory_presets/Pluck.json

@@ -0,0 +1,137 @@
+{
+  "metadata": {
+    "name": "Pluck",
+    "description": "Percussive pluck sound with fast attack and decay. Great for arpeggios, melodies, and rhythmic patterns.",
+    "author": "Lightningbeam",
+    "version": 1,
+    "tags": ["pluck", "lead", "percussive", "arpeggio"]
+  },
+  "nodes": [
+    {
+      "id": 0,
+      "node_type": "MidiInput",
+      "parameters": {},
+      "position": [100.0, 250.0]
+    },
+    {
+      "id": 1,
+      "node_type": "MidiToCV",
+      "parameters": {},
+      "position": [300.0, 250.0]
+    },
+    {
+      "id": 2,
+      "node_type": "Oscillator",
+      "parameters": {
+        "0": 440.0,
+        "1": 0.6,
+        "2": 2.0
+      },
+      "position": [500.0, 150.0]
+    },
+    {
+      "id": 3,
+      "node_type": "Filter",
+      "parameters": {
+        "0": 2000.0,
+        "1": 0.8,
+        "2": 0.0
+      },
+      "position": [700.0, 150.0]
+    },
+    {
+      "id": 4,
+      "node_type": "ADSR",
+      "parameters": {
+        "0": 0.001,
+        "1": 0.3,
+        "2": 0.0,
+        "3": 0.05
+      },
+      "position": [500.0, 350.0]
+    },
+    {
+      "id": 5,
+      "node_type": "ADSR",
+      "parameters": {
+        "0": 0.001,
+        "1": 0.4,
+        "2": 0.0,
+        "3": 0.1
+      },
+      "position": [700.0, 350.0]
+    },
+    {
+      "id": 6,
+      "node_type": "Gain",
+      "parameters": {
+        "0": 1.0
+      },
+      "position": [900.0, 200.0]
+    },
+    {
+      "id": 7,
+      "node_type": "AudioOutput",
+      "parameters": {},
+      "position": [1100.0, 200.0]
+    }
+  ],
+  "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
+    },
+    {
+      "from_node": 1,
+      "from_port": 1,
+      "to_node": 4,
+      "to_port": 0
+    },
+    {
+      "from_node": 1,
+      "from_port": 1,
+      "to_node": 5,
+      "to_port": 0
+    },
+    {
+      "from_node": 2,
+      "from_port": 0,
+      "to_node": 3,
+      "to_port": 0
+    },
+    {
+      "from_node": 4,
+      "from_port": 0,
+      "to_node": 3,
+      "to_port": 1
+    },
+    {
+      "from_node": 3,
+      "from_port": 0,
+      "to_node": 6,
+      "to_port": 0
+    },
+    {
+      "from_node": 5,
+      "from_port": 0,
+      "to_node": 6,
+      "to_port": 1
+    },
+    {
+      "from_node": 6,
+      "from_port": 0,
+      "to_node": 7,
+      "to_port": 0
+    }
+  ],
+  "midi_targets": [0],
+  "output_node": 7
+}

src-tauri/assets/factory_presets/Poly_Synth.json

@@ -0,0 +1,145 @@
+{
+  "metadata": {
+    "name": "Poly Synth",
+    "description": "8-voice polyphonic synthesizer with sawtooth oscillator and ADSR envelope. Perfect for chords and complex harmonies.",
+    "author": "Lightningbeam",
+    "version": 1,
+    "tags": ["poly", "polyphonic", "synth", "chords"]
+  },
+  "nodes": [
+    {
+      "id": 0,
+      "node_type": "MidiInput",
+      "parameters": {},
+      "position": [100.0, 200.0]
+    },
+    {
+      "id": 1,
+      "node_type": "VoiceAllocator",
+      "parameters": {
+        "0": 8.0
+      },
+      "position": [400.0, 200.0],
+      "template_graph": {
+        "metadata": {
+          "name": "template",
+          "description": "",
+          "author": "",
+          "version": 1,
+          "tags": []
+        },
+        "nodes": [
+          {
+            "id": 0,
+            "node_type": "TemplateInput",
+            "parameters": {},
+            "position": [100.0, 200.0]
+          },
+          {
+            "id": 1,
+            "node_type": "MidiToCV",
+            "parameters": {},
+            "position": [300.0, 200.0]
+          },
+          {
+            "id": 2,
+            "node_type": "Oscillator",
+            "parameters": {
+              "0": 440.0,
+              "1": 0.7,
+              "2": 1.0
+            },
+            "position": [500.0, 150.0]
+          },
+          {
+            "id": 3,
+            "node_type": "ADSR",
+            "parameters": {
+              "0": 0.01,
+              "1": 0.2,
+              "2": 0.6,
+              "3": 0.3
+            },
+            "position": [500.0, 300.0]
+          },
+          {
+            "id": 4,
+            "node_type": "Gain",
+            "parameters": {
+              "0": 1.0
+            },
+            "position": [700.0, 200.0]
+          },
+          {
+            "id": 5,
+            "node_type": "TemplateOutput",
+            "parameters": {},
+            "position": [900.0, 200.0]
+          }
+        ],
+        "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
+          },
+          {
+            "from_node": 1,
+            "from_port": 1,
+            "to_node": 3,
+            "to_port": 0
+          },
+          {
+            "from_node": 2,
+            "from_port": 0,
+            "to_node": 4,
+            "to_port": 0
+          },
+          {
+            "from_node": 3,
+            "from_port": 0,
+            "to_node": 4,
+            "to_port": 1
+          },
+          {
+            "from_node": 4,
+            "from_port": 0,
+            "to_node": 5,
+            "to_port": 0
+          }
+        ],
+        "midi_targets": [],
+        "output_node": 5
+      }
+    },
+    {
+      "id": 2,
+      "node_type": "AudioOutput",
+      "parameters": {},
+      "position": [700.0, 200.0]
+    }
+  ],
+  "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
+    }
+  ],
+  "midi_targets": [0],
+  "output_node": 2
+}

src-tauri/assets/factory_presets/Sawtooth_Bass.json

@@ -0,0 +1,137 @@
+{
+  "metadata": {
+    "name": "Sawtooth Bass",
+    "description": "Classic analog-style bass synth with sawtooth oscillator and resonant lowpass filter. Perfect for electronic music basslines.",
+    "author": "Lightningbeam",
+    "version": 1,
+    "tags": ["bass", "analog", "electronic", "mono"]
+  },
+  "nodes": [
+    {
+      "id": 0,
+      "node_type": "MidiInput",
+      "parameters": {},
+      "position": [100.0, 250.0]
+    },
+    {
+      "id": 1,
+      "node_type": "MidiToCV",
+      "parameters": {},
+      "position": [300.0, 250.0]
+    },
+    {
+      "id": 2,
+      "node_type": "Oscillator",
+      "parameters": {
+        "0": 110.0,
+        "1": 0.8,
+        "2": 1.0
+      },
+      "position": [500.0, 150.0]
+    },
+    {
+      "id": 3,
+      "node_type": "Filter",
+      "parameters": {
+        "0": 800.0,
+        "1": 2.5,
+        "2": 0.0
+      },
+      "position": [700.0, 150.0]
+    },
+    {
+      "id": 4,
+      "node_type": "ADSR",
+      "parameters": {
+        "0": 0.005,
+        "1": 0.2,
+        "2": 0.3,
+        "3": 0.1
+      },
+      "position": [500.0, 300.0]
+    },
+    {
+      "id": 5,
+      "node_type": "ADSR",
+      "parameters": {
+        "0": 0.005,
+        "1": 0.15,
+        "2": 0.6,
+        "3": 0.2
+      },
+      "position": [700.0, 350.0]
+    },
+    {
+      "id": 6,
+      "node_type": "Gain",
+      "parameters": {
+        "0": 1.2
+      },
+      "position": [900.0, 200.0]
+    },
+    {
+      "id": 7,
+      "node_type": "AudioOutput",
+      "parameters": {},
+      "position": [1100.0, 200.0]
+    }
+  ],
+  "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
+    },
+    {
+      "from_node": 1,
+      "from_port": 1,
+      "to_node": 4,
+      "to_port": 0
+    },
+    {
+      "from_node": 1,
+      "from_port": 1,
+      "to_node": 5,
+      "to_port": 0
+    },
+    {
+      "from_node": 2,
+      "from_port": 0,
+      "to_node": 3,
+      "to_port": 0
+    },
+    {
+      "from_node": 4,
+      "from_port": 0,
+      "to_node": 3,
+      "to_port": 1
+    },
+    {
+      "from_node": 3,
+      "from_port": 0,
+      "to_node": 6,
+      "to_port": 0
+    },
+    {
+      "from_node": 5,
+      "from_port": 0,
+      "to_node": 6,
+      "to_port": 1
+    },
+    {
+      "from_node": 6,
+      "from_port": 0,
+      "to_node": 7,
+      "to_port": 0
+    }
+  ],
+  "midi_targets": [0],
+  "output_node": 7
+}

src-tauri/assets/factory_presets/Warm_Pad.json

@@ -0,0 +1,176 @@
+{
+  "metadata": {
+    "name": "Warm Pad",
+    "description": "Lush pad sound combining sawtooth and triangle waves with slow filter sweep and gentle attack. Ideal for ambient and cinematic music.",
+    "author": "Lightningbeam",
+    "version": 1,
+    "tags": ["pad", "ambient", "warm", "cinematic"]
+  },
+  "nodes": [
+    {
+      "id": 0,
+      "node_type": "MidiInput",
+      "parameters": {},
+      "position": [100.0, 300.0]
+    },
+    {
+      "id": 1,
+      "node_type": "MidiToCV",
+      "parameters": {},
+      "position": [300.0, 300.0]
+    },
+    {
+      "id": 2,
+      "node_type": "Oscillator",
+      "parameters": {
+        "0": 440.0,
+        "1": 0.5,
+        "2": 1.0
+      },
+      "position": [500.0, 150.0]
+    },
+    {
+      "id": 3,
+      "node_type": "Oscillator",
+      "parameters": {
+        "0": 440.0,
+        "1": 0.4,
+        "2": 3.0
+      },
+      "position": [500.0, 250.0]
+    },
+    {
+      "id": 4,
+      "node_type": "Mixer",
+      "parameters": {
+        "0": 0.5,
+        "1": 0.5,
+        "2": 0.0,
+        "3": 0.0
+      },
+      "position": [700.0, 200.0]
+    },
+    {
+      "id": 5,
+      "node_type": "Filter",
+      "parameters": {
+        "0": 1200.0,
+        "1": 1.0,
+        "2": 0.0
+      },
+      "position": [900.0, 200.0]
+    },
+    {
+      "id": 6,
+      "node_type": "ADSR",
+      "parameters": {
+        "0": 0.8,
+        "1": 1.0,
+        "2": 0.6,
+        "3": 1.5
+      },
+      "position": [700.0, 400.0]
+    },
+    {
+      "id": 7,
+      "node_type": "ADSR",
+      "parameters": {
+        "0": 0.5,
+        "1": 0.5,
+        "2": 0.8,
+        "3": 1.0
+      },
+      "position": [900.0, 400.0]
+    },
+    {
+      "id": 8,
+      "node_type": "Gain",
+      "parameters": {
+        "0": 0.8
+      },
+      "position": [1100.0, 250.0]
+    },
+    {
+      "id": 9,
+      "node_type": "AudioOutput",
+      "parameters": {},
+      "position": [1300.0, 250.0]
+    }
+  ],
+  "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
+    },
+    {
+      "from_node": 1,
+      "from_port": 0,
+      "to_node": 3,
+      "to_port": 0
+    },
+    {
+      "from_node": 1,
+      "from_port": 1,
+      "to_node": 6,
+      "to_port": 0
+    },
+    {
+      "from_node": 1,
+      "from_port": 1,
+      "to_node": 7,
+      "to_port": 0
+    },
+    {
+      "from_node": 2,
+      "from_port": 0,
+      "to_node": 4,
+      "to_port": 0
+    },
+    {
+      "from_node": 3,
+      "from_port": 0,
+      "to_node": 4,
+      "to_port": 1
+    },
+    {
+      "from_node": 4,
+      "from_port": 0,
+      "to_node": 5,
+      "to_port": 0
+    },
+    {
+      "from_node": 6,
+      "from_port": 0,
+      "to_node": 5,
+      "to_port": 1
+    },
+    {
+      "from_node": 5,
+      "from_port": 0,
+      "to_node": 8,
+      "to_port": 0
+    },
+    {
+      "from_node": 7,
+      "from_port": 0,
+      "to_node": 8,
+      "to_port": 1
+    },
+    {
+      "from_node": 8,
+      "from_port": 0,
+      "to_node": 9,
+      "to_port": 0
+    }
+  ],
+  "midi_targets": [0],
+  "output_node": 9
+}

src-tauri/src/audio.rs

@@ -1,7 +1,7 @@
 use daw_backend::{AudioEvent, AudioSystem, EngineController, EventEmitter, WaveformPeak};
 use std::sync::{Arc, Mutex};
 use std::collections::HashMap;
-use tauri::{Emitter};
+use tauri::{Emitter, Manager};
 
 #[derive(serde::Serialize)]
 pub struct AudioFileMetadata {
@@ -693,6 +693,204 @@ pub async fn graph_set_output_node(
     }
 }
 
+// Preset management commands
+
+#[tauri::command]
+pub async fn graph_save_preset(
+    app_handle: tauri::AppHandle,
+    state: tauri::State<'_, Arc<Mutex<AudioState>>>,
+    track_id: u32,
+    preset_name: String,
+    description: String,
+    tags: Vec<String>,
+) -> Result<String, String> {
+    use std::fs;
+
+    let mut audio_state = state.lock().unwrap();
+    if let Some(controller) = &mut audio_state.controller {
+        // Get user presets directory
+        let app_data_dir = app_handle.path().app_data_dir()
+            .map_err(|e| format!("Failed to get app data directory: {}", e))?;
+        let presets_dir = app_data_dir.join("presets");
+
+        // Create presets directory if it doesn't exist
+        fs::create_dir_all(&presets_dir)
+            .map_err(|e| format!("Failed to create presets directory: {}", e))?;
+
+        // Create preset path
+        let filename = format!("{}.json", preset_name.replace(" ", "_"));
+        let preset_path = presets_dir.join(&filename);
+        let preset_path_str = preset_path.to_string_lossy().to_string();
+
+        // Send command to save preset
+        controller.graph_save_preset(
+            track_id,
+            preset_path_str.clone(),
+            preset_name,
+            description,
+            tags
+        );
+
+        Ok(preset_path_str)
+    } else {
+        Err("Audio not initialized".to_string())
+    }
+}
+
+#[tauri::command]
+pub async fn graph_load_preset(
+    state: tauri::State<'_, Arc<Mutex<AudioState>>>,
+    track_id: u32,
+    preset_path: String,
+) -> Result<(), String> {
+    let mut audio_state = state.lock().unwrap();
+    if let Some(controller) = &mut audio_state.controller {
+        // Send command to load preset
+        controller.graph_load_preset(track_id, preset_path);
+        Ok(())
+    } else {
+        Err("Audio not initialized".to_string())
+    }
+}
+
+#[derive(serde::Serialize)]
+pub struct PresetInfo {
+    pub name: String,
+    pub path: String,
+    pub description: String,
+    pub author: String,
+    pub tags: Vec<String>,
+    pub is_factory: bool,
+}
+
+#[tauri::command]
+pub async fn graph_list_presets(
+    app_handle: tauri::AppHandle,
+) -> Result<Vec<PresetInfo>, String> {
+    use daw_backend::GraphPreset;
+    use std::fs;
+
+    let mut presets = Vec::new();
+
+    // Load factory presets from bundled assets
+    let factory_presets = [
+        "Basic_Sine.json",
+        "Sawtooth_Bass.json",
+        "Warm_Pad.json",
+        "Pluck.json",
+        "Poly_Synth.json",
+    ];
+
+    for preset_file in &factory_presets {
+        // Try to load from resource directory
+        if let Ok(resource_dir) = app_handle.path().resource_dir() {
+            let factory_path = resource_dir.join("assets/factory_presets").join(preset_file);
+            if let Ok(json) = fs::read_to_string(&factory_path) {
+                if let Ok(preset) = GraphPreset::from_json(&json) {
+                    presets.push(PresetInfo {
+                        name: preset.metadata.name,
+                        path: factory_path.to_string_lossy().to_string(),
+                        description: preset.metadata.description,
+                        author: preset.metadata.author,
+                        tags: preset.metadata.tags,
+                        is_factory: true,
+                    });
+                }
+            }
+        }
+    }
+
+    // Load user presets
+    if let Ok(app_data_dir) = app_handle.path().app_data_dir() {
+        let user_presets_dir = app_data_dir.join("presets");
+        if user_presets_dir.exists() {
+            if let Ok(entries) = fs::read_dir(user_presets_dir) {
+                for entry in entries.flatten() {
+                    if let Ok(path) = entry.path().canonicalize() {
+                        if path.extension().and_then(|s| s.to_str()) == Some("json") {
+                            if let Ok(json) = fs::read_to_string(&path) {
+                                if let Ok(preset) = GraphPreset::from_json(&json) {
+                                    presets.push(PresetInfo {
+                                        name: preset.metadata.name,
+                                        path: path.to_string_lossy().to_string(),
+                                        description: preset.metadata.description,
+                                        author: preset.metadata.author,
+                                        tags: preset.metadata.tags,
+                                        is_factory: false,
+                                    });
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    Ok(presets)
+}
+
+#[tauri::command]
+pub async fn graph_delete_preset(
+    preset_path: String,
+) -> Result<(), String> {
+    use std::fs;
+
+    // Only allow deleting user presets (not factory presets)
+    if preset_path.contains("factory") || preset_path.contains("assets") {
+        return Err("Cannot delete factory presets".to_string());
+    }
+
+    fs::remove_file(&preset_path)
+        .map_err(|e| format!("Failed to delete preset: {}", e))?;
+
+    Ok(())
+}
+
+#[tauri::command]
+pub async fn graph_get_state(
+    state: tauri::State<'_, Arc<Mutex<AudioState>>>,
+    track_id: u32,
+) -> Result<String, String> {
+    use daw_backend::GraphPreset;
+
+    let mut audio_state = state.lock().unwrap();
+    if let Some(controller) = &mut audio_state.controller {
+        // Send a command to get the graph state
+        // For now, we'll use the preset serialization to get the graph
+        let temp_path = std::env::temp_dir().join(format!("temp_graph_state_{}.json", track_id));
+        let temp_path_str = temp_path.to_string_lossy().to_string();
+
+        controller.graph_save_preset(
+            track_id,
+            temp_path_str.clone(),
+            "temp".to_string(),
+            "".to_string(),
+            vec![]
+        );
+
+        // Give the audio thread time to process
+        std::thread::sleep(std::time::Duration::from_millis(50));
+
+        // Read the temp file
+        let json = match std::fs::read_to_string(&temp_path) {
+            Ok(json) => json,
+            Err(_) => {
+                // If file doesn't exist, graph is likely empty - return empty preset
+                let empty_preset = GraphPreset::new("empty");
+                empty_preset.to_json().unwrap_or_else(|_| "{}".to_string())
+            }
+        };
+
+        // Clean up temp file
+        let _ = std::fs::remove_file(&temp_path);
+
+        Ok(json)
+    } else {
+        Err("Audio not initialized".to_string())
+    }
+}
+
 #[derive(serde::Serialize, Clone)]
 #[serde(tag = "type")]
 pub enum SerializedAudioEvent {

src-tauri/src/lib.rs

@@ -222,6 +222,11 @@ pub fn run() {
         audio::graph_disconnect,
         audio::graph_set_parameter,
         audio::graph_set_output_node,
+        audio::graph_save_preset,
+        audio::graph_load_preset,
+        audio::graph_list_presets,
+        audio::graph_delete_preset,
+        audio::graph_get_state,
       ])
       // .manage(window_counter)
       .build(tauri::generate_context!())

src-tauri/tauri.conf.json

@@ -34,6 +34,9 @@
       "icons/icon.icns",
       "icons/icon.ico"
     ],
+    "resources": [
+      "assets/factory_presets/*"
+    ],
     "linux": {
       "appimage": {
         "bundleMediaFramework": true,

src/layouts.js

@@ -72,7 +72,7 @@ export const defaultLayouts = {
 
   audioDaw: {
     name: "Audio/DAW",
-    description: "Audio tracks prominent with mixer and node editor",
+    description: "Audio tracks prominent with mixer, node editor, and preset browser",
     layout: {
       type: "horizontal-grid",
       percent: 75,
@@ -85,7 +85,7 @@ export const defaultLayouts = {
             { type: "pane", name: "nodeEditor"}
           ]
         },
-        { type: "pane", name: "infopanel" }
+        { type: "pane", name: "presetBrowser" }
       ]
     }
   },

src/main.js

@@ -6042,6 +6042,18 @@ async function renderMenu() {
 }
 updateMenu();
 
+// Helper function to get the current MIDI track
+function getCurrentMidiTrack() {
+  const activeLayer = context.activeObject?.activeLayer;
+  if (!activeLayer || !(activeLayer instanceof AudioTrack) || activeLayer.type !== 'midi') {
+    return null;
+  }
+  if (activeLayer.audioTrackId === null) {
+    return null;
+  }
+  return activeLayer.audioTrackId;
+}
+
 function nodeEditor() {
   // Create container for the node editor
   const container = document.createElement("div");
@@ -6291,17 +6303,25 @@ function nodeEditor() {
 
     // Send command to backend
     // If parent node exists, add to VoiceAllocator template; otherwise add to main graph
+    const trackId = getCurrentMidiTrack();
+    if (trackId === null) {
+      console.error('No MIDI track selected');
+      showNodeEditorError(container, 'Please select a MIDI track first');
+      editor.removeNodeId(`node-${drawflowNodeId}`);
+      return;
+    }
+
     const commandName = parentNodeId ? "graph_add_node_to_template" : "graph_add_node";
     const commandArgs = parentNodeId
       ? {
-          trackId: 0,
+          trackId: trackId,
           voiceAllocatorId: editor.getNodeFromId(parentNodeId).data.backendId,
           nodeType: nodeType,
           x: x,
           y: y
         }
       : {
-          trackId: 0,
+          trackId: trackId,
           nodeType: nodeType,
           x: x,
           y: y
@@ -6318,14 +6338,17 @@ function nodeEditor() {
       // If this is an AudioOutput node, automatically set it as the graph output
       if (nodeType === "AudioOutput") {
         console.log(`Setting node ${backendNodeId} as graph output`);
-        invoke("graph_set_output_node", {
-          trackId: 0,
-          nodeId: backendNodeId
-        }).then(() => {
-          console.log("Output node set successfully");
-        }).catch(err => {
-          console.error("Failed to set output node:", err);
-        });
+        const currentTrackId = getCurrentMidiTrack();
+        if (currentTrackId !== null) {
+          invoke("graph_set_output_node", {
+            trackId: currentTrackId,
+            nodeId: backendNodeId
+          }).then(() => {
+            console.log("Output node set successfully");
+          }).catch(err => {
+            console.error("Failed to set output node:", err);
+          });
+        }
       }
 
       // If this is a VoiceAllocator, automatically create template I/O nodes inside it
@@ -6477,14 +6500,17 @@ function nodeEditor() {
 
             // Send to backend
             if (nodeData.data.backendId !== null) {
-              invoke("graph_set_parameter", {
-                trackId: 0,
-                nodeId: nodeData.data.backendId,
-                paramId: paramId,
-                value: value
-              }).catch(err => {
-                console.error("Failed to set parameter:", err);
-              });
+              const currentTrackId = getCurrentMidiTrack();
+              if (currentTrackId !== null) {
+                invoke("graph_set_parameter", {
+                  trackId: currentTrackId,
+                  nodeId: nodeData.data.backendId,
+                  paramId: paramId,
+                  value: value
+                }).catch(err => {
+                  console.error("Failed to set parameter:", err);
+                });
+              }
             }
           }
         });
@@ -6632,48 +6658,54 @@ function nodeEditor() {
           // Both nodes are inside the same VoiceAllocator - connect in template
           const parentNode = editor.getNodeFromId(outputParent);
           console.log(`Connecting in VoiceAllocator template ${parentNode.data.backendId}: node ${outputNode.data.backendId} port ${outputPort} -> node ${inputNode.data.backendId} port ${inputPort}`);
-          invoke("graph_connect_in_template", {
-            trackId: 0,
-            voiceAllocatorId: parentNode.data.backendId,
-            fromNode: outputNode.data.backendId,
-            fromPort: outputPort,
-            toNode: inputNode.data.backendId,
-            toPort: inputPort
-          }).then(() => {
-            console.log("Template connection successful");
-          }).catch(err => {
-            console.error("Failed to connect nodes in template:", err);
-            showError("Template connection failed: " + err);
-            // Remove the connection
-            editor.removeSingleConnection(
-              connection.output_id,
-              connection.input_id,
-              connection.output_class,
-              connection.input_class
-            );
-          });
+          const currentTrackId = getCurrentMidiTrack();
+          if (currentTrackId !== null) {
+            invoke("graph_connect_in_template", {
+              trackId: currentTrackId,
+              voiceAllocatorId: parentNode.data.backendId,
+              fromNode: outputNode.data.backendId,
+              fromPort: outputPort,
+              toNode: inputNode.data.backendId,
+              toPort: inputPort
+            }).then(() => {
+              console.log("Template connection successful");
+            }).catch(err => {
+              console.error("Failed to connect nodes in template:", err);
+              showError("Template connection failed: " + err);
+              // Remove the connection
+              editor.removeSingleConnection(
+                connection.output_id,
+                connection.input_id,
+                connection.output_class,
+                connection.input_class
+              );
+            });
+          }
         } else {
           // Normal connection in main graph
           console.log(`Connecting: node ${outputNode.data.backendId} port ${outputPort} -> node ${inputNode.data.backendId} port ${inputPort}`);
-          invoke("graph_connect", {
-            trackId: 0,
-            fromNode: outputNode.data.backendId,
-            fromPort: outputPort,
-            toNode: inputNode.data.backendId,
-            toPort: inputPort
-          }).then(() => {
-            console.log("Connection successful");
-          }).catch(err => {
-            console.error("Failed to connect nodes:", err);
-            showError("Connection failed: " + err);
-            // Remove the connection
-            editor.removeSingleConnection(
-              connection.output_id,
-              connection.input_id,
-              connection.output_class,
-              connection.input_class
-            );
-          });
+          const currentTrackId = getCurrentMidiTrack();
+          if (currentTrackId !== null) {
+            invoke("graph_connect", {
+              trackId: currentTrackId,
+              fromNode: outputNode.data.backendId,
+              fromPort: outputPort,
+              toNode: inputNode.data.backendId,
+              toPort: inputPort
+            }).then(() => {
+              console.log("Connection successful");
+            }).catch(err => {
+              console.error("Failed to connect nodes:", err);
+              showError("Connection failed: " + err);
+              // Remove the connection
+              editor.removeSingleConnection(
+                connection.output_id,
+                connection.input_id,
+                connection.output_class,
+                connection.input_class
+              );
+            });
+          }
         }
       }
 
@@ -6695,15 +6727,18 @@ function nodeEditor() {
 
     // Send to backend
     if (outputNode.data.backendId !== null && inputNode.data.backendId !== null) {
-      invoke("graph_disconnect", {
-        trackId: 0,
-        fromNode: outputNode.data.backendId,
-        fromPort: outputPort,
-        toNode: inputNode.data.backendId,
-        toPort: inputPort
-      }).catch(err => {
-        console.error("Failed to disconnect nodes:", err);
-      });
+      const currentTrackId = getCurrentMidiTrack();
+      if (currentTrackId !== null) {
+        invoke("graph_disconnect", {
+          trackId: currentTrackId,
+          fromNode: outputNode.data.backendId,
+          fromPort: outputPort,
+          toNode: inputNode.data.backendId,
+          toPort: inputPort
+        }).catch(err => {
+          console.error("Failed to disconnect nodes:", err);
+        });
+      }
     }
   }
 
@@ -6719,6 +6754,132 @@ function nodeEditor() {
     }, 3000);
   }
 
+  // Function to reload graph from backend
+  async function reloadGraph() {
+    if (!editor) return;
+
+    const trackId = getCurrentMidiTrack();
+
+    // Clear editor first
+    editor.clearModuleSelected();
+    editor.clear();
+
+    // If no MIDI track selected, just leave it cleared
+    if (trackId === null) {
+      console.log('No MIDI track selected, editor cleared');
+      return;
+    }
+
+    try {
+      const graphJson = await invoke('graph_get_state', { trackId });
+      const preset = JSON.parse(graphJson);
+
+      // If graph is empty (no nodes), just leave cleared
+      if (!preset.nodes || preset.nodes.length === 0) {
+        console.log('Graph is empty, editor cleared');
+        return;
+      }
+
+      // Rebuild from preset
+      const nodeMap = new Map(); // Maps backend node ID to Drawflow node ID
+
+      // Add all nodes
+      for (const serializedNode of preset.nodes) {
+        const nodeType = serializedNode.node_type;
+        const nodeDef = nodeTypes[nodeType];
+        if (!nodeDef) continue;
+
+        // Create node HTML
+        let html = `<div class="node-content"><div class="node-title">${nodeDef.name}</div>`;
+        for (const param of nodeDef.parameters) {
+          const value = serializedNode.parameters[param.id] || param.default;
+          html += `<div class="node-parameter">
+            <label>${param.name}</label>
+            <input type="range" data-param-id="${param.id}" min="${param.min}" max="${param.max}" step="${param.step || 0.01}" value="${value}" />
+            <span class="param-value">${value.toFixed(2)}</span>
+          </div>`;
+        }
+        html += `</div>`;
+
+        // Add node to Drawflow
+        const drawflowId = editor.addNode(
+          nodeType,
+          nodeDef.inputs.length,
+          nodeDef.outputs.length,
+          serializedNode.position[0],
+          serializedNode.position[1],
+          nodeType,
+          { nodeType, backendId: serializedNode.id, parentNodeId: null },
+          html,
+          false
+        );
+
+        nodeMap.set(serializedNode.id, drawflowId);
+
+        // Style ports
+        setTimeout(() => styleNodePorts(drawflowId, nodeDef), 10);
+
+        // Wire up parameter controls
+        setTimeout(() => {
+          const nodeElement = container.querySelector(`#node-${drawflowId}`);
+          if (!nodeElement) return;
+
+          nodeElement.querySelectorAll('input[type="range"]').forEach(slider => {
+            const paramId = parseInt(slider.dataset.paramId);
+            const displaySpan = slider.nextElementSibling;
+
+            slider.addEventListener('input', (e) => {
+              const value = parseFloat(e.target.value);
+              if (displaySpan) {
+                const param = nodeDef.parameters.find(p => p.id === paramId);
+                displaySpan.textContent = value.toFixed(param?.unit === 'Hz' ? 0 : 2);
+              }
+
+              const currentTrackId = getCurrentMidiTrack();
+              if (currentTrackId !== null) {
+                invoke("graph_set_parameter", {
+                  trackId: currentTrackId,
+                  nodeId: serializedNode.id,
+                  paramId: paramId,
+                  value: value
+                }).catch(err => {
+                  console.error("Failed to set parameter:", err);
+                });
+              }
+            });
+          });
+        }, 100);
+      }
+
+      // Add all connections
+      for (const conn of preset.connections) {
+        const outputDrawflowId = nodeMap.get(conn.from_node);
+        const inputDrawflowId = nodeMap.get(conn.to_node);
+
+        if (outputDrawflowId && inputDrawflowId) {
+          // Drawflow uses 1-based port indexing
+          editor.addConnection(
+            outputDrawflowId,
+            inputDrawflowId,
+            `output_${conn.from_port + 1}`,
+            `input_${conn.to_port + 1}`
+          );
+        }
+      }
+
+      console.log('Graph reloaded from backend');
+    } catch (error) {
+      console.error('Failed to reload graph:', error);
+      showError(`Failed to reload graph: ${error}`);
+    }
+  }
+
+  // Store reload function in context so it can be called from preset browser
+  context.reloadNodeEditor = reloadGraph;
+
+  // Initial load of graph
+  setTimeout(() => reloadGraph(), 200);
+
   return container;
 }
 
@@ -6882,6 +7043,296 @@ function pianoRoll() {
   return canvas;
 }
 
+function presetBrowser() {
+  const container = document.createElement("div");
+  container.className = "preset-browser-pane";
+
+  container.innerHTML = `
+    <div class="preset-browser-header">
+      <h3>Instrument Presets</h3>
+      <button class="preset-btn preset-save-btn" title="Save current graph as preset">
+        <span>💾</span> Save Preset
+      </button>
+    </div>
+    <div class="preset-filter">
+      <input type="text" id="preset-search" placeholder="Search presets..." />
+      <select id="preset-tag-filter">
+        <option value="">All Tags</option>
+      </select>
+    </div>
+    <div class="preset-categories">
+      <div class="preset-category">
+        <h4>Factory Presets</h4>
+        <div class="preset-list" id="factory-preset-list">
+          <div class="preset-loading">Loading...</div>
+        </div>
+      </div>
+      <div class="preset-category">
+        <h4>User Presets</h4>
+        <div class="preset-list" id="user-preset-list">
+          <div class="preset-empty">No user presets yet</div>
+        </div>
+      </div>
+    </div>
+  `;
+
+  // Load presets after DOM insertion
+  setTimeout(async () => {
+    await loadPresetList(container);
+
+    // Set up save button handler
+    const saveBtn = container.querySelector('.preset-save-btn');
+    if (saveBtn) {
+      saveBtn.addEventListener('click', () => showSavePresetDialog(container));
+    }
+
+    // Set up search and filter
+    const searchInput = container.querySelector('#preset-search');
+    const tagFilter = container.querySelector('#preset-tag-filter');
+
+    if (searchInput) {
+      searchInput.addEventListener('input', () => filterPresets(container));
+    }
+    if (tagFilter) {
+      tagFilter.addEventListener('change', () => filterPresets(container));
+    }
+  }, 0);
+
+  return container;
+}
+
+async function loadPresetList(container) {
+  try {
+    const presets = await invoke('graph_list_presets');
+
+    const factoryList = container.querySelector('#factory-preset-list');
+    const userList = container.querySelector('#user-preset-list');
+    const tagFilter = container.querySelector('#preset-tag-filter');
+
+    // Collect all unique tags
+    const allTags = new Set();
+    presets.forEach(preset => {
+      preset.tags.forEach(tag => allTags.add(tag));
+    });
+
+    // Populate tag filter
+    if (tagFilter) {
+      allTags.forEach(tag => {
+        const option = document.createElement('option');
+        option.value = tag;
+        option.textContent = tag.charAt(0).toUpperCase() + tag.slice(1);
+        tagFilter.appendChild(option);
+      });
+    }
+
+    // Separate factory and user presets
+    const factoryPresets = presets.filter(p => p.is_factory);
+    const userPresets = presets.filter(p => !p.is_factory);
+
+    // Render factory presets
+    if (factoryList) {
+      if (factoryPresets.length === 0) {
+        factoryList.innerHTML = '<div class="preset-empty">No factory presets found</div>';
+      } else {
+        factoryList.innerHTML = factoryPresets.map(preset => createPresetItem(preset)).join('');
+        addPresetItemHandlers(factoryList);
+      }
+    }
+
+    // Render user presets
+    if (userList) {
+      if (userPresets.length === 0) {
+        userList.innerHTML = '<div class="preset-empty">No user presets yet</div>';
+      } else {
+        userList.innerHTML = userPresets.map(preset => createPresetItem(preset)).join('');
+        addPresetItemHandlers(userList);
+      }
+    }
+  } catch (error) {
+    console.error('Failed to load presets:', error);
+    const factoryList = container.querySelector('#factory-preset-list');
+    const userList = container.querySelector('#user-preset-list');
+    if (factoryList) factoryList.innerHTML = '<div class="preset-error">Failed to load presets</div>';
+    if (userList) userList.innerHTML = '';
+  }
+}
+
+function createPresetItem(preset) {
+  const tags = preset.tags.map(tag => `<span class="preset-tag">${tag}</span>`).join('');
+  const deleteBtn = preset.is_factory ? '' : '<button class="preset-delete-btn" title="Delete preset">🗑️</button>';
+
+  return `
+    <div class="preset-item" data-preset-path="${preset.path}" data-preset-tags="${preset.tags.join(',')}">
+      <div class="preset-item-header">
+        <span class="preset-name">${preset.name}</span>
+        ${deleteBtn}
+      </div>
+      <div class="preset-description">${preset.description || 'No description'}</div>
+      <div class="preset-tags">${tags}</div>
+      <div class="preset-author">by ${preset.author || 'Unknown'}</div>
+    </div>
+  `;
+}
+
+function addPresetItemHandlers(listElement) {
+  // Load preset on click
+  listElement.querySelectorAll('.preset-item').forEach(item => {
+    item.addEventListener('click', async (e) => {
+      // Don't trigger if clicking delete button
+      if (e.target.classList.contains('preset-delete-btn')) return;
+
+      const presetPath = item.dataset.presetPath;
+      await loadPreset(presetPath);
+    });
+  });
+
+  // Delete preset on delete button click
+  listElement.querySelectorAll('.preset-delete-btn').forEach(btn => {
+    btn.addEventListener('click', async (e) => {
+      e.stopPropagation();
+      const item = btn.closest('.preset-item');
+      const presetPath = item.dataset.presetPath;
+      const presetName = item.querySelector('.preset-name').textContent;
+
+      if (confirm(`Delete preset "${presetName}"?`)) {
+        try {
+          await invoke('graph_delete_preset', { presetPath });
+          // Reload preset list
+          const container = btn.closest('.preset-browser-pane');
+          await loadPresetList(container);
+        } catch (error) {
+          alert(`Failed to delete preset: ${error}`);
+        }
+      }
+    });
+  });
+}
+
+async function loadPreset(presetPath) {
+  const trackId = getCurrentMidiTrack();
+  if (trackId === null) {
+    alert('Please select a MIDI track first');
+    return;
+  }
+
+  try {
+    await invoke('graph_load_preset', {
+      trackId: trackId,
+      presetPath
+    });
+
+    // Refresh the node editor to show the loaded preset
+    await context.reloadNodeEditor?.();
+
+    console.log('Preset loaded successfully');
+  } catch (error) {
+    alert(`Failed to load preset: ${error}`);
+  }
+}
+
+function showSavePresetDialog(container) {
+  const currentTrackId = getCurrentMidiTrack();
+  if (currentTrackId === null) {
+    alert('Please select a MIDI track first');
+    return;
+  }
+
+  // Create modal dialog
+  const dialog = document.createElement('div');
+  dialog.className = 'modal-overlay';
+  dialog.innerHTML = `
+    <div class="modal-dialog">
+      <h3>Save Preset</h3>
+      <form id="save-preset-form">
+        <div class="form-group">
+          <label>Preset Name</label>
+          <input type="text" id="preset-name" required placeholder="My Awesome Synth" />
+        </div>
+        <div class="form-group">
+          <label>Description</label>
+          <textarea id="preset-description" placeholder="Describe the sound..." rows="3"></textarea>
+        </div>
+        <div class="form-group">
+          <label>Tags (comma-separated)</label>
+          <input type="text" id="preset-tags" placeholder="bass, lead, pad" />
+        </div>
+        <div class="form-actions">
+          <button type="button" class="btn-cancel">Cancel</button>
+          <button type="submit" class="btn-primary">Save</button>
+        </div>
+      </form>
+    </div>
+  `;
+
+  document.body.appendChild(dialog);
+
+  // Focus name input
+  setTimeout(() => dialog.querySelector('#preset-name')?.focus(), 100);
+
+  // Handle cancel
+  dialog.querySelector('.btn-cancel').addEventListener('click', () => {
+    dialog.remove();
+  });
+
+  // Handle save
+  dialog.querySelector('#save-preset-form').addEventListener('submit', async (e) => {
+    e.preventDefault();
+
+    const name = dialog.querySelector('#preset-name').value.trim();
+    const description = dialog.querySelector('#preset-description').value.trim();
+    const tagsInput = dialog.querySelector('#preset-tags').value.trim();
+    const tags = tagsInput ? tagsInput.split(',').map(t => t.trim()).filter(t => t) : [];
+
+    if (!name) {
+      alert('Please enter a preset name');
+      return;
+    }
+
+    try {
+      await invoke('graph_save_preset', {
+        trackId: currentTrackId,
+        presetName: name,
+        description,
+        tags
+      });
+
+      dialog.remove();
+
+      // Reload preset list
+      await loadPresetList(container);
+
+      alert(`Preset "${name}" saved successfully!`);
+    } catch (error) {
+      alert(`Failed to save preset: ${error}`);
+    }
+  });
+
+  // Close on background click
+  dialog.addEventListener('click', (e) => {
+    if (e.target === dialog) {
+      dialog.remove();
+    }
+  });
+}
+
+function filterPresets(container) {
+  const searchTerm = container.querySelector('#preset-search')?.value.toLowerCase() || '';
+  const selectedTag = container.querySelector('#preset-tag-filter')?.value || '';
+
+  const allItems = container.querySelectorAll('.preset-item');
+
+  allItems.forEach(item => {
+    const name = item.querySelector('.preset-name').textContent.toLowerCase();
+    const description = item.querySelector('.preset-description').textContent.toLowerCase();
+    const tags = item.dataset.presetTags.split(',');
+
+    const matchesSearch = !searchTerm || name.includes(searchTerm) || description.includes(searchTerm);
+    const matchesTag = !selectedTag || tags.includes(selectedTag);
+
+    item.style.display = (matchesSearch && matchesTag) ? 'block' : 'none';
+  });
+}
+
 const panes = {
   stage: {
     name: "stage",
@@ -6919,6 +7370,10 @@ const panes = {
     name: "node-editor",
     func: nodeEditor,
   },
+  presetBrowser: {
+    name: "preset-browser",
+    func: presetBrowser,
+  },
 };
 
 /**
@@ -7179,6 +7634,9 @@ async function addEmptyMIDITrack() {
       context.timelineWidget.requestRedraw();
     }
 
+    // Refresh node editor to show empty graph
+    setTimeout(() => context.reloadNodeEditor?.(), 100);
+
     console.log('Empty MIDI track created:', trackName, 'with ID:', newMIDITrack.audioTrackId);
   } catch (error) {
     console.error('Failed to create empty MIDI track:', error);

src/styles.css

@@ -1307,3 +1307,287 @@ button {
   0%, 70% { opacity: 1; }
   100% { opacity: 0; }
 }
+
+/* Preset Browser Pane Styling */
+.preset-browser-pane {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+  background: #1e1e1e;
+  color: #ddd;
+  overflow: hidden;
+}
+
+.preset-browser-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 12px 16px;
+  background: #252525;
+  border-bottom: 1px solid #3d3d3d;
+}
+
+.preset-browser-header h3 {
+  margin: 0;
+  font-size: 16px;
+  font-weight: 500;
+  color: #fff;
+}
+
+.preset-btn {
+  background: #4CAF50;
+  color: white;
+  border: none;
+  padding: 6px 12px;
+  border-radius: 4px;
+  cursor: pointer;
+  font-size: 13px;
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  transition: background 0.2s;
+}
+
+.preset-btn:hover {
+  background: #45a049;
+}
+
+.preset-btn span {
+  font-size: 16px;
+}
+
+.preset-filter {
+  padding: 12px 16px;
+  background: #252525;
+  border-bottom: 1px solid #3d3d3d;
+  display: flex;
+  gap: 8px;
+}
+
+.preset-filter input,
+.preset-filter select {
+  flex: 1;
+  background: #1e1e1e;
+  color: #ddd;
+  border: 1px solid #3d3d3d;
+  padding: 6px 10px;
+  border-radius: 4px;
+  font-size: 13px;
+}
+
+.preset-filter input:focus,
+.preset-filter select:focus {
+  outline: none;
+  border-color: #4CAF50;
+}
+
+.preset-categories {
+  flex: 1;
+  overflow-y: auto;
+  padding: 12px;
+}
+
+.preset-category {
+  margin-bottom: 24px;
+}
+
+.preset-category h4 {
+  margin: 0 0 12px 0;
+  font-size: 13px;
+  font-weight: 600;
+  color: #999;
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+}
+
+.preset-list {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.preset-item {
+  background: #252525;
+  border: 1px solid #3d3d3d;
+  border-radius: 4px;
+  padding: 10px 12px;
+  cursor: pointer;
+  transition: all 0.2s;
+}
+
+.preset-item:hover {
+  background: #2d2d2d;
+  border-color: #4CAF50;
+}
+
+.preset-item-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 6px;
+}
+
+.preset-name {
+  font-size: 14px;
+  font-weight: 500;
+  color: #fff;
+}
+
+.preset-delete-btn {
+  background: transparent;
+  border: none;
+  color: #f44336;
+  cursor: pointer;
+  font-size: 16px;
+  padding: 2px 6px;
+  border-radius: 3px;
+  transition: background 0.2s;
+}
+
+.preset-delete-btn:hover {
+  background: rgba(244, 67, 54, 0.2);
+}
+
+.preset-description {
+  font-size: 12px;
+  color: #999;
+  margin-bottom: 6px;
+  line-height: 1.4;
+}
+
+.preset-tags {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 4px;
+  margin-bottom: 4px;
+}
+
+.preset-tag {
+  background: #3d3d3d;
+  color: #aaa;
+  font-size: 10px;
+  padding: 2px 6px;
+  border-radius: 3px;
+  text-transform: lowercase;
+}
+
+.preset-author {
+  font-size: 11px;
+  color: #777;
+  font-style: italic;
+}
+
+.preset-loading,
+.preset-empty,
+.preset-error {
+  padding: 20px;
+  text-align: center;
+  color: #777;
+  font-size: 13px;
+}
+
+.preset-error {
+  color: #f44336;
+}
+
+/* Modal Dialog for Save Preset */
+.modal-overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background: rgba(0, 0, 0, 0.7);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 10000;
+}
+
+.modal-dialog {
+  background: #252525;
+  border: 1px solid #3d3d3d;
+  border-radius: 6px;
+  padding: 24px;
+  min-width: 400px;
+  max-width: 500px;
+  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
+}
+
+.modal-dialog h3 {
+  margin: 0 0 20px 0;
+  font-size: 18px;
+  color: #fff;
+}
+
+.form-group {
+  margin-bottom: 16px;
+}
+
+.form-group label {
+  display: block;
+  margin-bottom: 6px;
+  font-size: 13px;
+  color: #aaa;
+  font-weight: 500;
+}
+
+.form-group input,
+.form-group textarea {
+  width: 100%;
+  background: #1e1e1e;
+  color: #ddd;
+  border: 1px solid #3d3d3d;
+  padding: 8px 10px;
+  border-radius: 4px;
+  font-size: 13px;
+  font-family: inherit;
+  box-sizing: border-box;
+}
+
+.form-group input:focus,
+.form-group textarea:focus {
+  outline: none;
+  border-color: #4CAF50;
+}
+
+.form-group textarea {
+  resize: vertical;
+  min-height: 60px;
+}
+
+.form-actions {
+  display: flex;
+  justify-content: flex-end;
+  gap: 10px;
+  margin-top: 20px;
+}
+
+.btn-cancel,
+.btn-primary {
+  padding: 8px 16px;
+  border-radius: 4px;
+  font-size: 13px;
+  cursor: pointer;
+  border: none;
+  font-weight: 500;
+  transition: background 0.2s;
+}
+
+.btn-cancel {
+  background: #3d3d3d;
+  color: #ddd;
+}
+
+.btn-cancel:hover {
+  background: #4d4d4d;
+}
+
+.btn-primary {
+  background: #4CAF50;
+  color: white;
+}
+
+.btn-primary:hover {
+  background: #45a049;
+}

src/widgets.js

@@ -2839,6 +2839,9 @@ class TimelineWindowV2 extends Widget {
       // Clear selections when selecting layer
       this.context.selection = []
       this.context.shapeselection = []
+
+      // Clear node editor when selecting a non-audio layer
+      setTimeout(() => this.context.reloadNodeEditor?.(), 50);
     } else if (track.type === 'shape') {
       // Find the layer this shape belongs to and select it
       for (let i = 0; i < this.context.activeObject.allLayers.length; i++) {
@@ -2862,6 +2865,11 @@ class TimelineWindowV2 extends Widget {
       this.context.activeObject.activeLayer = track.object
       this.context.selection = []
       this.context.shapeselection = []
+
+      // If this is a MIDI track, reload the node editor
+      if (track.object.type === 'midi') {
+        setTimeout(() => this.context.reloadNodeEditor?.(), 50);
+      }
     }
 
     // Update the stage UI to reflect selection changes