stop sound with action script?

simple example with 2 buttons 'play' and 'stop', pls try to use it to clear how this work..

create 2 buttons and give them instance names: play_btn and stop_btn

put your .mp3 file to the same folder with your .fla file

and write code:

var req:URLRequest = new URLRequest("CRICKET.mp3");
var sound:Sound = new Sound();
var controller:SoundChannel;

function soundLoaded(event:Event):void
{
     controller = sound.play();
     controller.stop();
     play_btn.addEventListener(MouseEvent.CLICK, playSound);
     stop_btn.addEventListener(MouseEvent.CLICK, stopSound);
}

function playSound(event:MouseEvent):void
{
     controller = sound.play();
}

function stopSound(event:MouseEvent):void
{
     controller.stop();
}

sound.addEventListener(Event.COMPLETE, soundLoaded);
sound.load(req);

How are you playing the sound? Are you using a script or is it on the timeline? If script, could you share a bit of it so we know how you're starting the file?