message: testing `cancel`
diff: @@ -109,6 +109,26 @@ define(["helper/Basic", "Tone/event/Part", "Tone/core/Tone",
  });
  });
  + it("can cancel event changes", function(){
  + var count = 0;
  + return Offline(function(Transport){
  + var part = new Part(function(time){
  + count++;
  + }, [{
  + "time" : 0,
  + "note" : "C3"
  + },
  + {
  + "time" : 0.2,
  + "note" : "D3"
  + }]).start(0).stop(0.1);
  + part.cancel(0.1);
  + Transport.start(0);
  + }, 0.3).then(function(){
  + expect(count).to.equal(2);
  + });
  + });
  +
  it("can add an event as a time and value", function(){
  return Offline(function(){
  var part = new Part();
  