I have a Marshall JMP 2203 that I usually run with the Master volume on about 8 and Preamp volume on 7. It sounds great and all, but I want just a tiny bit more gain and harmonics out of it. The Majik Box Rocket Fuel and Fuzz Universe both seem like really cool pedals to boost the front of the amp with but I'm not sure which one to get. Both of these pedals have a boost and overdrive in the same unit. I want the boost to be transparent and will not cut the bottom end like most tubescreamer type pedals where they add midrange but the bottom isn't as thick. Something I can leave on all the time for rhythm and won't color the tone too much. Can anybody tell me the differences between the two pedals and the way their boost and overdrive circuits are voiced?