How to play a soud at specific frame?

Question

I have the loading audio file at frame one. However, I want to play the audio only at specific frame or frame lable. How do I do that? Below are my codes:
//start of sound section is for sound
var soundReq:URLRequest = new URLRequest("FlashFiles/audioFiles/mySoundmp3");
var sound:Sound = new Sound();
sound.load(soundReq);
sound.addEventListener(Event.COMPLETE, onComplete);
//end of sound section
function onComplete(event:Event):void
    sound.play();
The above plays the sound as soon as the .swf file is loaded. But I want to play at certain point in time, say frame number or frame lable.

Answer 1

Okay, here are my code in frame one:
//start of sound section is for sound
var soundReq:URLRequest = new URLRequest("FlashFiles/audioFiles/Alma Mater plus roc.mp3");
var sound:Sound = new Sound();
sound.load(soundReq);
//sound.addEventListener(Event.COMPLETE, onComplete);
//end of sound section
this.addEventListener(Event.ENTER_FRAME, playSound);
function playSound(e:Event)
    if(e.currentLabel == "lblStartSound")
            this.removeEventListener(Event.ENTER_FRAME, playSound);
            sound.play();
this.btn_Skip.addEventListener(MouseEvent.MOUSE_DOWN, skipFlash);
function skipFlash(event:MouseEvent):void
    gotoAndPlay("frm_Ending");
    sound.stop();
Errors I got are:
1119: Access of possibly undefined property currentLabel through a reference with static type flash.events:Event.
Source: if(e.currentLabel = "lblStartSound")
1061: Call to a possibly undefined method stop through a reference with static type flash.media:Sound.
Source: sound.stop();
Eventually, if the user click the skip button, I want to stop the sound.