Improve MIDI search and add browser playback engines.

src/core/MotifEngine.ts

@@ -1,4 +1,4 @@
-import type { NoteEvent, StructuralFeatures, MotifConfig, SynthLayer } from '../types';
+import type { NoteEvent, StructuralFeatures, MotifConfig } from '../types';
 import { MIDIProcessor } from '../midi/MIDIProcessor';
 import { MIDIParser } from '../midi/MIDIParser';
 import { MIDIService } from '../services/MIDIService';
@@ -106,6 +106,12 @@ export class MotifEngine {
     }
   }
 
+  setVolume(volume: number): void {
+    if (this.synthesisEngine) {
+      this.synthesisEngine.setVolume(volume);
+    }
+  }
+
   private generateSyntheticMIDI(songName: string): NoteEvent[] {
     // Generate procedural MIDI based on song name hash
     const hash = this.simpleHash(songName);

src/core/RoleMapper.ts

@@ -76,7 +76,7 @@ export class RoleMapper {
     };
   }
 
-  private calculateRoleScores(features: TrackFeatures, globalFeatures: StructuralFeatures): Map<Role, number> {
+  private calculateRoleScores(features: TrackFeatures, _globalFeatures: StructuralFeatures): Map<Role, number> {
     const scores = new Map<Role, number>();
 
     // Bass scoring
@@ -130,7 +130,7 @@ export class RoleMapper {
     return scores;
   }
 
-  private allocateRoles(roleScores: Map<number, Map<Role, number>>, trackEvents: Map<number, NoteEvent[]>): Map<number, Role> {
+  private allocateRoles(roleScores: Map<number, Map<Role, number>>, _trackEvents: Map<number, NoteEvent[]>): Map<number, Role> {
     const assignments = new Map<number, Role>();
     const assignedRoles = new Set<Role>();