After much thought and discussion with my teacher, I purchased an older model Contra (from Danny Adair!). It arrived yesterday afternoon. The first thing I did when I got home was plug it in a play all fo my instruments through it. As advertised, this is the clearest amp I have ever played through-- no coloration at all. When I first played my URB through it, I wasn't even sure it was on or not-- it was that clear. It sounded just like my bass, only louder. So far I'm very impressed, and can hardly wait to try it out on a gig.