Load Sound

import flash.events.Event;
import flash.media.Sound;
import flash.media.SoundChannel;
import flash.net.URLRequest;
 
var urlRequest:URLRequest;
var sound:Sound;

function loadSound(url:String):void {
    urlRequest = new URLRequest(url);
    sound = new Sound();
    sound.addEventListener(Event.COMPLETE, loadSoundComplete);
    sound.load(urlRequest);
}

function loadSoundComplete(e:Event):void {
 sound.play();
}

loadSound("sound.mp3");