To answer some questions, the three pots left rear of the amp are presence, depth, and mid voicing controls. The knob on the right rear is a 5 way saturation control, my favorite. On the front you have a bright switch and 2 gains.
I thought I'd also post the thread I purchased it from for value purposes. I don't believe in profiting from fellow enthusiasts. Cheers! viewtopic.php?f=6&t=195855&hilit=Sovtek