music on /off script

var music:Sound = new Sound(new URLRequest("music.mp3"));
var trans:SoundTransform = new SoundTransform(1, -1);
var channel:SoundChannel = music.play(0, 1, trans);
var musicOn:Boolean = true
onOff.addEventListener(MouseEvent.CLICK, onOffSound);
function onOffSound(e:Event) {
    if (musicOn == true) {
        musicOn = false;
        trans.volume=0;
        SoundMixer.soundTransform = trans;
    } else {
        musicOn = true;
        trans.volume=1;
        SoundMixer.soundTransform = trans;
    }
}