I just want to say how consistently impressed I am with this head. I know that people prefer the non-pro, but man my 2-PRO sounds sweet. The built-in OD is killer, it's rapidly replacing all of my dirt, OD and Fuzz pedals. I don't know why that feature isn't talked about more - it's SO GOOD. Anyway, what do other 2-PRO users think? Are you using the Drive knob?