Referencing problem

programming flash
1

For some reason this works by itself, but when loaded into another movie via loadMovie, it stops working. Can someone please help troubleshoot this?

stop();
onRollOver = function() {
 this.onEnterFrame = function() {
  nextFrame();
 };
 if (soundOn != true) {
  descSound = new Sound();
  descSound.attachSound("weTrySND");
  myVolume = 100;
  descSound.setVolume(myVolume);
  descSound.start();
  soundOn = true;
 }
};
onRollOut = function() {
 this.onEnterFrame = function() {
  prevFrame();
  descSound.setVolume(myVolume);
  myVolume = myVolume-5;
  if (myVolume<5) {
   descSound.stop();
   soundOn = false;
  }
 };
};