How can I play an animation when audio is streaming?

[npm]

I have a streaming audio player that works, but I want to add a movie clip that plays when the audio is actually streaming and stops when the audio stops. So far, my actionscript plays the animation right away, when I push the play button, even before the audio is actually playing.

Here's my code:

function getSound(url:String) {
	sound.stop();
	delete sound;
	sound = new Sound();
	sound.loadSound(url, true);
}

function audioStop() {
	sound.stop();
	$marker = sound.position/1000;
	$state = false;
	_root.animation.gotoAndStop(1);
}

function audioPlay() {
	sound.start($marker);
	$state = true;
	_root.animation.play();
}

function checkState() {
	if ($state == true) {
		audioStop();
	}
	else {
		audioPlay();
	}
}

getSound("urlofaudio.mp3");
sound.stop();
var $state = false;
var $marker = 0;
trigger_btn.onRelease = checkState;

Anyway, everything like this that I get stuck on, I'm sure it's something simple that I've overlooked. I'm pretty sure I just need to tweak something in the audioPlay() function.

Any help would be appreciated.

Thanks in advance!