I just snagged this little beast in a partial trade/sale transaction. So, of course I ran home to plug it in. I wasn't sure what to make of it at first, but i think I've got it sorted now. No manual or labels on anything does make for a bit of a hunt but thanks to the internet, answers aren't that hidden. First run with it was into my Demeter VTBP M 800 D > Barefaced Two10 cab with my J bass. My impressions are that small dial moves make a big change. Getting the tone over noon is more bass than I want or need, but it's enough to make the solo bridge pickup on my Jazz a mean metal machine. I was impressed at how it adds just enough grind and color to pop out (when playing along with the stereo) vs. the clean tone. It isn't radically dirty, but enough. A little goes a long way. I'm going to have fun with this beast. I guess they weren't terribly popular based on them being discontinued, and the fact that only a dozen were ordered out of the final production run (stated in a thread here).