Is that like a Fender Sidekick Reverb? I have always wanted to try one of those... I have no idea how those 3 Vol/Gain/Master knobs interact. Does the Gain knob add volume, or just clipping/distortion? If you turn the Master all the way down and Volume all the way up, is there any sound? How about Vol all the way up and Master all the way down? Gain all the way down?