public function play(_class:Class, loops:uint = 0):void{

                        var snd:Sound = new (_class)();

                        channel = snd.play(0,loops);

                        channel.addEventListener(Event.SOUND_COMPLETE,soundComplete,false,0,true);

                }

 

                private function soundComplete(event:Event):void{

                        trace('soundComplete ' + event.target);

                }

private var channelToSoundMap:Dictionary = new Dictionary(true);

...

channelToSoundMap[channel] = snd;

...

var snd:Sound = channelToSoundMap[event.target] as Sound;