I just picked up this monster a few days ago and Im blown away. Now Im searching the web for info, schematics, and what not and can't find much. The controls are very different from any other amp I've ever owned. The EQ section is way different. Instead of the standard Bass, Mid, and Treble this head uses Bass and Treble only with an added Varimetric 2-band semi-parametric EQ which includes a frequency knob for both bass and treble as well as a level knob to adjust the frequencies selected. If anyone out there has played through one of these these Id love to get you opinions.