message: adding types
diff: @@ -267,7 +267,7 @@ export class TickSource<Type extends BPM | Hertz> extends ToneWithContext<TickSo
  * source.start("+0.1");
  * source.getStateAtTime("+0.1"); //returns "started"
  */
  - getStateAtTime(time): PlaybackState {
  + getStateAtTime(time: Time): PlaybackState {
  time = this.toSeconds(time);
  return this._state.getValueAtTime(time);
  }
  