Sound control problem

1

I have always been using this code

onClipEvent(load)
    {
        
        _root.mySound = new Sound();
        maxvolume=100;
        minvolume=0;
    }
    
onClipEvent(enterFrame)
    {
        if(_root.soundstatus=="on") {step=3}
        if(_root.soundstatus=="off") {step=-3}
        
        maxvolume+=step;
        
        if (maxvolume>100) {maxvolume=100;}
        if (maxvolume<0) {maxvolume=0;}        
    
        _root.mySound.setVolume(maxvolume);
    }

to control the on/off function of the background music.
Ever since I upgraded to Flash Pro 8 this code has given me problems. The music doesn’t play at all.
I know the problem might be the onClipEvent(enterFrame), but I can’t figure out how to solve it.
Does anyone has a solution to this problem?