Tweak looping sources to maybe fix a popping problem

src/sources/LoopingSource.ts

@@ -44,10 +44,8 @@ export class LoopingSource extends Source {
     this.source = context.createBufferSource();
     this.source.buffer = this.soundSet.soundList[index];
     this.source.connect(this.gain);
-    this.source.onended = () => {
-      this.pickRandom();
-      this.source.start();
-    };
+    this.source.loop = true;
+    this.source.loopEnd = this.source.buffer.duration - 0.1;
   }
   public tick(dt: number): void {
     super.tick(dt);