hehe, yeah, its definately kicking some ass atm, now that i've had the chance to play with it a little, I've found that i can use the blues channel on my Mesa as a great gain boost for it, and also, with it set up right, now much of an e.q. difference - it still sounds like a JCM800! :D i always thought that the 4104 was a single channel, and the inputs were just applying different levels of gain on the same preamp. (like a split channel kind of idea?) I'm probably wrong, and everyone else is probably right, but i thought the 4211 (or something like that) was the 2 channel version? no? doesn't really matter either way - it sounds great, and i can coax almost any sound i desire!