message: looping sync example
diff: @@ -250,6 +250,9 @@ export abstract class Source<Options extends SourceOptions> extends ToneAudioNod
  * osc.sync().start(0).stop(0.3);
  * // start the transport.
  * Transport.start();
  + * // set it to loop once a second
  + * Transport.loop = true;
  + * Transport.loopEnd = 1;
  */
  sync(): this {
  if (!this._synced) {
  