The original two controls were balance and shape. Balance is output volume. Shape forces the output through a small capacitor. It reminds of a Muff or Fuzzrite tone control. Shape's low end makes me think that this might be a great platform for a bass fuzz.
One common mod to this circuit is a clipping diode lift switch. The non-clipped fuzz is sort of plain sounding but much louder than the clipped signal. With the diodes engaged the fuzz volume is lower than unity volume at the treble end of the tone spectrum. Perhaps one could use LEDs in the clipping section to strangle the output volume less. The other common mod is a gain (fuzz) control.
The end result is a fuzz that covers a lot of sonic territory. With lower fuzz and no clipping it is a fairly usable distortion. With the fuzz cranked, diodes engaged and especially at the treble end of the spectrum at is pretty gnarly and nasty. Lower the fuzz and you are in Satisfaction territory.
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