The Rusty Box/ Traynor TS-50B preamp actually already do have a unique multi-band distortion going on that is really the secret sauce in the circuit. After the Fender-type passive EQ, the sound is split into 3 separate frequency bands (each with their own clipping transistors) then recombined. Unfortunately there are no fine controls to adjust the specific gain or level of each frequency band though (the EQ kinda does it in a broad sense at least as far as how pushing/attenuating any of the EQ will create more/less gain in that general area- though the EQ and split gain stages are only distantly related, but nothing like the deep control found in the other stuff mentioned in this thread). I never found the need for clean lows when using a Rusty Box, but also almost always used it set with pretty low gain and I tend to prefer a pretty tight sound anyway. It's definitely not the pedal for big booty bass! One thing often overlooked about the Rusty is that it uses a Fender-type EQ, so the "flat" sound is with Bass and Treble turned most of the way down and the Midrange turned most of the way up (if not all the way- the Mid is actually modified from the traditional Fender type, so doesn't work quite the same though is effectively still a cut-only circuit) and the EQ definitely favors the Treble/high-mid part of the circuit- so if you want more bass, turn the treble down first!
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