public BeatController(BeatModelInterface model) {
   this.model = model;
   view = new DJView(this, model);
   view.createView();
   view.createControls();
   view.disableStopMenuItem();
   view.enableStartMenuItem();
   model.initialize();
 }
 public void stop() {
   model.off();
   view.disableStopMenuItem();
   view.enableStartMenuItem();
 }