sound fast forward script not working

[vblevin]

I placed the following code on a one frame movie clip, but it doesn't work. The tutorial that i got it from said to place it on a one frame movie clip that loops. mine does not loop. is that the problem? if so how do i loop it?
I'm a beginner please help.
this.onEnterFrame = function () {
//Reverse
if (REV==1 && myMusicPosition>0) {
_root.myMusic.stop("myMusic01");
myMusicPosition=myMusicPosition-.5; //The .5 is the decremented amount.
_root.myMusic.start(myMusicPosition,0);
}
revButton.onPress = function () {
REV=1;
myMusicPosition=_root.myMusic.position/1000;
//
}
revButton.onRelease = function () {
REV=0
}
//Fast Forward
if (FF==1 && myMusic.position < myMusic.duration) {
_root.myMusic.stop("myMusic01");
myMusicPosition=myMusicPosition+.5;//The .5 is the incremented amount.
_root.myMusic.start(myMusicPosition,0);
}
FFButton.onPress = function () {
FF=1;
myMusicPosition=_root.myMusic.position/1000;
}
FFButton.onRelease = function () {
FF=0
}
//END
}