message: souce has 1 output
diff: @@ -103,6 +103,7 @@ export abstract class Source<Options extends SourceOptions> extends ToneAudioNod
  static getDefaults(): SourceOptions {
  return Object.assign(ToneAudioNode.getDefaults(), {
  mute: false,
  + numberOfOutputs: 1,
  volume: 0,
  });
  }
  