Sample AS3 code to play the audio (sound) file from library for background loop and controlling the audio.
var MySound:Sound = new MySound(); // audio file in Library var soundChannel:SoundChannel; var playLoop:Boolean = true; function playSound(e:MouseEvent):void { soundChannel = MySound.play(); if(playLoop){ soundChannel.addEventListener(Event.SOUND_COMPLETE, onComplete); } } function onComplete(event:Event):void { SoundChannel(event.target).removeEventListener(event.type, onComplete); playSound(); } function stopSound(e:MouseEvent):void { SoundMixer.stopAll() } function setVolume(volume:Number):void { var transform:SoundTransform = soundChannel.soundTransform; transform.volume = volume; soundChannel.soundTransform = transform; } function muteSound(e:MouseEvent):void { SoundMixer.soundTransform = new SoundTransform(0); } function unMuteSound(e:MouseEvent):void { SoundMixer.soundTransform = new SoundTransform(1); }