dynamic play sound as3

var mySoundReq:URLRequest = new URLRequest("Audio/wissel.mp3");
var mySound:Sound = new Sound();
var mySoundChannel:SoundChannel = new SoundChannel();
mySound.load(mySoundReq);

play_btn.addEventListener(MouseEvent.CLICK, playSound):
stop_btn.addEventListener(MouseEvent.CLICK, stopSound):

function  playSound void {
          mySoundChannel = mySound.play();
}

function  playSound void {
          mySoundChannel = mySound.play();
}