Trying to do better but it's hard

src/lib/csound/execution-context.ts

@@ -78,6 +78,10 @@ export class ExecutionContext {
     await this.endSession();
     this.currentMode = newMode;
     this.strategy = this.createStrategyForMode(newMode);
+
+    if (newMode === 'composition') {
+      await this.csound.stop();
+    }
   }
 
   private createStrategyForMode(mode: ProjectMode): ExecutionStrategy {