Several fixes and new example

src/core.rs

@@ -3,6 +3,7 @@
 //! This module contains the fundamental data structures used throughout
 //! the musicgen library for representing notes, tracks, and compositions.
 
+use crate::config::EffectConfig;
 use crate::scales::ScaleType;
 use crate::synthesis::Waveform;
 
@@ -44,6 +45,7 @@ pub enum InstrumentType {
 }
 
 /// A track represents a single instrument part
+/// Track represents a single instrument part in a composition
 #[derive(Debug, Clone)]
 pub struct Track {
     pub name: String,
@@ -52,6 +54,7 @@ pub struct Track {
     pub volume: f32,
     pub instrument_type: InstrumentType,
     pub waveform: Waveform,
+    pub effect_configs: Vec<EffectConfig>,
 }
 
 /// Composition styles (kept for compatibility)
@@ -299,6 +302,7 @@ mod tests {
             volume: 0.8,
             instrument_type: InstrumentType::Lead,
             waveform: Waveform::Sawtooth,
+            effect_configs: Vec::new(),
         };
 
         composition.tracks.push(track);