Dirty loader. what is the unload concept? Please help me.

Question

I have load external swf file with loader. The external swf file have animation with embeded mp3 file . when i click the btn unload the external swf file .external swf file is unload ok. But Problam is after few seconds sound is hearing. I think  animation still running in  backend when reach the first frame sound is hearing.
var ldr:Loader=new Loader()
ldr.load(new URLRequest("test.swf"))
addChild(ldr)
btn.addEventListener(MouseEvent.CLICK,unloadmovie)
function unloadmovie(e:MouseEvent){
    ldr.unload()
    SoundMixer.stopAll()

Answer 1

1. Sir the problam is not only sound if ihave write a ENTER_FRAME function  after unload it is still working.
2. fp is greater than 12
3. Sir iam allready used SoundMixer.stopAll()
Actually we are loading  different swf files . How to we capture all events, sounds. How can as3 Loader.unload()  work as a as2 unloadmovie().