Wren and Cuff Suppa Phat Phuk The Suppa Phat Phuk is the same well loved buffered dirty germanium boost as before, with two new tweakable knobs. The bias knob, a mega useful add-on allowing on the fy adjustments to the germanium transistor's voltage feed, giving more or less grit to the sound (this adjustment was formerly only able to be tweaked via an internal trim pot). The Phatness knob, which let's you roll between the beefy lows of the Phat B, and the mid-range goodness of the Phat Guitar. Turn the knob even more for a tone beyond either of its predecessors reminiscent of the old germanium treble boosts of yore.