setUpTremoloOnPlay = function(that, arg, Wad){
	that.tremolo.wad = new Wad({
		source : that.tremolo.shape,
		pitch  : that.tremolo.speed,
		volume : that.tremolo.magnitude,
		env    : {
			attack : that.tremolo.attack,
			hold   : 10
		},
		destination : that.gain[0].gain
	});
	that.tremolo.wad.play();
}
Initialize and configure a tremolo LFO Wad for playback *