The two vastly different fuzzes are blended together via the Ge/Si knob for a layered fuzz tone. Each fuzz has a choice of three gain settings via toggle switch. The Master knob controls the output of the final mix, and has enough gain on tap to cause a supernova.
The unique tone control affects each fuzz independently, yet at the same time. 12:00 yields a balanced full range fuzz, turn CW for a fantastic mid-scoop and CCW to smooth out the highs. The remaining toggle switch controls the direction of the tone-sweep for the germanium side, allowing for opposite sweep directions. The controls allow for many tone combinations between the two fuzz circuits, for some very unique fuzz blend.
The Gemini III covers a wide range of usable fuzz territory, including lower-gain classic tones, heavy high-gain/scooped-mid tones and so much more. There's plenty of low frequency response on hand to make for an equally awesome bass fuzz (highly recommended for bass). Also great for baritone and synth.