Woah, I was out for a day and what a lot of excellent options you folks put forth!! Thanks...someone was asking for a more detailed definition of what I'm looking for, and if I'm thinking of using a preamp with the pedal, and what my real budget price range is. Answer #1 is - I'm not quite sure!! I'd like to get the smooth natural sound of a large tube amp being run hot...although it would be nice to be able to get a bit over the top on occasion. I've tried things like the Boss ODB-3 and the Sansamp Bass Driver, and both of them sounded artificial, fizzy and overly gritty to me. I wouldn't be running a preamp (although several of my basses are active and have preamps in them...does that count?), and my price range would be topping out at around $100 or thereabouts. I'm running an old Jazz Bass or a Kawai FB2 (or sometimes a Peavey Grind 6 or a Douglas 6) into a GK RB400 and a Fearless F112 cabinet. Thanks again!!