AS3 stopping audio streaming inside a layer

Question

Sometimes I get ahead of myself and have to stop and say how the hell did I do this before? I'm referring to a simple stop button I need to put in a flash animation. I know how to code calling a sound from the library, starting and stopping. But how do I stop audio that is streaming inside a layer from a button ?
var my_sound:Sound = new Sound();
my_sound.load(new URLRequest("yoursoundfile.mp3"));
var my_channel:SoundChannel = new SoundChannel();
//2.
play_btn.addEventListener(MouseEvent.CLICK, playSound);
stop_btn.addEventListener(MouseEvent.CLICK, stopSound);
//3.
function playSound(event:MouseEvent):void{
my_channel = my_sound.play();
//4.
function stopSound(event:MouseEvent):void{
my_channel.stop();

Answer 1

OK what I actually need is a mute and play button for the audio track
So how can I stop, or in this case mute the audio without stopping the animation, follow?
example, volume is at 100
click button volume goes to 0
click same button or another button volume goes back to 100