var sprMain:Sprite = new Sprite();
this.addChild(sprMain);

var s:Sound = new Sound();
s.load(new URLRequest("loop.mp3"));

var sc:SoundChannel;
sc = s.play(0, 1000);

var ba:ByteArray = new ByteArray();

this.addEventListener(Event.ENTER_FRAME, showAmplitude);

function showAmplitude(eventArgs:Event) {	
	SoundMixer.computeSpectrum(ba,true,0);
	
	sprMain.graphics.clear();
	for(var i=0; i < 256; i++) {
		a = ba.readFloat();
		var num:Number = a*100;
		sprMain.graphics.moveTo(i*3, 400);
		sprMain.graphics.lineStyle(2, 0x009E00, 1);
		sprMain.graphics.lineTo(i*3, 400-(num*2));
	}
}