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package 
{
	import flash.media.Sound;
	import flash.media.SoundChannel;
	import flash.events.Event;
	import flash.net.URLRequest;
 
	public class MyClass
	{
		public var snd:Sound;
		public var channel:SoundChannel;
 
		public function MyClass()
		{
			snd = new Sound();
			snd.addEventListener(Event.COMPLETE, completeHandler);
			snd.load(new URLRequest("sound.mp3"));
		}
		private function completeHandler(evt:Event):void
		{
			channel = snd.play();
			channel.addEventListener(Event.SOUND_COMPLETE, soundCompleteHandler);
		}
		private function soundCompleteHandler(evt:Event):void
		{
			channel.removeEventListener(Event.SOUND_COMPLETE, soundCompleteHandler);
			channel = snd.play();
			channel.addEventListener(Event.SOUND_COMPLETE, soundCompleteHandler);
		}
	}
}

как-то так