Compared to its Pigtronix siblings, the Fat Drive is a simple affair, just volume, gain, tone (turn it all the way up to disengage the tone circuit altogether) and a ?more? switch, which doubles the buzz. It comes with an 18 volt adapter for more headroom, but it works just fine on a standard 9 volt daisy chain and, in truth, its hard to tell the difference when you arent listening for it. The pedal is also smaller than its brethren, which means it doesnt take up too much space on a pedal board. This is good news, because it plays so well with others. For a full rhythm sound, just leave it on all the time, clicking in other effects at will. But it also works great as a lead boost in conjunction with another overdrive pedal.