message: test if context is AudioContext before trying to resume
diff: @@ -40,7 +40,11 @@ export function setContext(context: BaseAudioContext): void {
  * document.querySelector('#playbutton').addEventListener('click', () => Tone.start())
  */
  export function start(): Promise <void> {
  + if (globalContext instanceof AudioContext) {
  return globalContext.resume();
  + } else {
  + return Promise.resolve();
  + }
  }
  /**
  