Just in case someone looking for answer to change volume while zooming in/out:
stage.addEventListener(MouseEvent.MOUSE_WHEEL, mouseWheelHandler);
function mouseWheelHandler(event:MouseEvent):void {
trace("mouseWheelHandler: " + event.delta);
//increase volumen when zooming
trace("actual audio: mysound0 );
trace("actual volume is " + myVol);
if (event.delta > 0)
{
myVol=myVol + 1;
audiopano.set("plugin[mysound0]volume",myVol/10);
}else{
myVol=myVol - 1;
audiopano.set("plugin[mysound0].volume",myVol/10);
}
}