Fade Sound in AS3

Question

I have been trying for a while now to get sound to fade. Right now the sound plays using this in one frame:
var applause:Applause = new Applause();
var channel2:SoundChannel = applause.play();
A couple frames away I tried this to get it to fade:
var SoundFade = 1;
var i = 0;
do
SoundMixer.soundTransform = new SoundTransform(SoundFade,0);// 1=vol, 0=pan
trace("SoundFade "+SoundFade);
SoundFade = SoundFade - .1;
trace("i "+i);
i = i + 1;
} while (i!=10);
Doesn't work. I understand from postings that AS3 is buggy with sound and TweenLite might be a better option so I have also tried this:
TweenLite.to(channel2, 1, {volume:0});
This gives me this error:
ReferenceError: Error #1069: Property volume not found on flash.media.SoundChannel and there is no default value.
at com.greensock::TweenLite/init()
at com.greensock::TweenLite/renderTime()
at com.greensock.core::SimpleTimeline/renderTime()
at com.greensock::TweenLite$/updateAll()
Can someone please help me with this? Very frustrated.
-Kirk

Answer 1

Here is how fading should be implemented using TweenLite. I tested this code and it works perfectly. You will need to accommodate this to your needs - for instance I loaded sound at runtime - just replace loading routine with instantiating sound from your fla library:
var sound:Sound;
var channel:SoundChannel;
var sTransf:SoundTransform;
loadSound();
function loadSound():void
     sound = new Sound();
     sound.load(new URLRequest("sound.mp3"));
     sTransf = new SoundTransform();
     channel = sound.play();
     channel.soundTransform = sTransf;
     var timer:Timer = new Timer(2000, 1);
     timer.addEventListener(TimerEvent.TIMER, onTimer);
     timer.start();
function onTimer(e:TimerEvent):void
     TweenLite.to(sTransf, 3, { volume: 0, onUpdate: updateChannel, onComplete: onFadeComplete } );
function onFadeComplete():void
     channel.stop();
function updateChannel():void {
     channel.soundTransform = sTransf;