ff: true, voicesOff: [1]};
				play(options);
			});

			startMelodyButton.addEventListener("click", function() {
				var options = {chordsOff: true, voicesOff: [0]};
				play(options);
			});

			startAllButton.addEventListener("click", function() {
				var options = {};
				play(options);
			});

			function play(options) {
				startChordsButton.setAttribute("style", "display:none;");
				startMelodiesButton.setAttribute("style", "display:none;");
				startHarmonyButton.setAttribute("style", "display:none