Muting sound on rewind

I have a navigation system that uses the following code.

this.onEnterFrame = function(){
if(rewind == true){
this.onRollOver = function(){
rewind = false;
this.onRollOut = function(){
rewind = true;

Anyway, I was using that but I wanted to put in button rollover sounds. I had it start on the second frame, but the problem was that on rollOut it would play the sound again. And that’s not what I want.

I tried using the mySound setVolume(0); command, or something similar. I thought it’d do the trick, but it didn’t do anything to it.

I was wondering if there was something I could put into my AS that would play the sound from the library on rollOver, or mute the sound on rollOut. Thanks in advance.