TweenLite has a function called delayedCall() that’s specifically for this:

import gs.TweenLite;

var snd:Sound = new Sound(new URLRequest("sound.mp3"));

TweenLite.delayedCall(1, onPlaySound);
function onPlaySound():void{
	snd.play();
}

Delayed call takes two parameters, delay and the callback function. TweenLite’s delayedCall() is nearly identical to setTimeout() from the flash.utils package. The main difference is that setTimeout() requires that its delay argument be in milliseconds:

var snd:Sound = new Sound(new URLRequest("sound.mp3"));

setTimeout(onPlaySound, 1000);

function onPlaySound():void{
	snd.play();
}

Hope that helps.

var snd:Sound = new Sound(new URLRequest(”sound.mp3″));
TweenLite.to(snd, .45, {play:1, delay:2});