For the last several months I've been using a SansAmp RBI in my bass rig. All I'm using is the SansAmp box, a Crown Macro Tech 1200, my bass and a speaker cabinet. This thing is very simple, reliable, easy to haul around and it sounds great. My question for those who have more technical knowlege than me is how does the SansAmp really work? I've opened the box and there is almost NOTHING inside! From what I can tell, as you increase the drive it seems to compress the signal as well as changing the frequency response all at the same time. The controls are also interactive with the whole thing, does anybody have an idea about what they are really using in the circuit? I've been using this thing live and also for some recording and with it I've ditched my compressor and tube preamp from before and I couldn't be happier as have many other folks who also use this unit in their setup.