var volumeTransform:SoundTransform = new SoundTransform(1, 0);        

var slider:Slider = new Slider();

slider.liveDragging = true;

slider.maximum = 1;

slider.minimum = 0;

slider.tickInterval = 1;

slider.addEventListener(SliderEvent.CHANGE, on_SliderEvent_CHANGE );

private function on_SliderEvent_CHANGE (event:SliderEvent):void{

volumeTransform.volume = (event.target.value);

}