Sound object jitters, ideas?

Hi everyone,

                      i've just built a sound reactive thing in flash that works with some proximity code, my question is how can i sort out the fact that it constantly jitters. firstly, look at it here -

www.willgoldstone.com

I’m using a standard sound object and updating the sound volume as it gets closer to the bulb by judging the mouse cursor position. this is all done on an enterFrame function, with the creation of my sound object before it -

s = new Sound ();
s.attachSound (“push”);
s.setVolume(50);
s.start(0,999);

onEnterFrame=function(){

Distance = Math.sqrt(((393-_xmouse)(393-_xmouse)) + ((292-_ymouse)(292-_ymouse)))

if (Distance>45){
transition.gotoAndStop(20);
s.setVolume(50);
}

there are many more if statements which set the volume differently depending on distance. now I know i can do the proximity part of this coding in a better way, but i’m more concerned about reworking the sound element which I’m fairly sure doesnt have to do with the way i’ve set that up. Any ideas as to why it’d jitter like it does would be much much appreciated.

             Thank you

                     Will