after a tuner, I think anyone playing with distortion should have a clean blend pedal of some sort, or a preamp/DI with a volume control and a Y cable. Trying to find a bass distortion that doesn't suck low end is difficult and really limits your search. Being able to blend in some clean low end under your distortion really helps with the quality of your sound- besides distortions sucking out your low end, distortion compresses your signal and takes out the attack/punch from your sound. You'd be surprised how much better your sound is with some of that clean, uncompressed signal coming back in under your distortion.