From the ROG site:
The revisited circuit captures much of the amp's tone. The brilliant treble response is replicated, along with the Tone control range. A sweet overdrive even kicks in at nearly the same point in the Volume pot's rotation! If you are looking for an articulate blues or classic rock sound, this is a good place to start. Many sounds, from Albert King-type tones to a Led Zeppelin sonic blitzkrieg to sparkling clean can be produced with the Supreaux Deux. Be sure to work your guitar's volume knob and your pick attack when playing with this circuit, as it is very sensitive and dynamic.
Edit: The bass switch is a SPST.
Edit 3/4/15: I noticed my original layout wasn't quite right in the charge pump section. I've updated the layout and was actually able to shave a column off it on the right side.