The magic direct box of the bass world. The Bass Driver seems to improve and enhance just about any rig it's patch into. If you think your tone is unstoppable now, you may want to wait until you have a Bass Driver inline. You won't hear a bad word about this box from anyone here at GuitarGeek. It's really that good. Six knobs tackle level, blend, treble, bass, presence, and drive handle all your tweaking chores, while a single stompswitch activates the effect. I think the only reason Tech 21 put and on/off switch on this box is to show you how lame your rig sounds when this is off! The Bass Driver has a really amazing way of thickening your tone but at the same time tightening it. We always leave ours on. It is now part of our permanent bass sound.