The first section, FB, is a two-stage asymmetric diode-feedback topology using high-beta bipolar transistors for gain. It ends up being a very nonlinear waveshaper that is sensitive to waveform symmetry. I find a lot of really interesting tones in the middle knob range on this one as the gain ends up controlling where in the waveform the nonlinearities occur.
FF is an asymmetric feed-forward diode clipper using op-amps for gain. This one is a pretty straight-forward diode clip with just enough asymmetry to make it fun. The knob goes from soft clip to heavy overdrive.
FZ is a high-gain bipolar fuzz. The knob blends between differently phased sections which gives the knob a low-pass to high-pass frequency response as it is turned up. The distortion is a bit more subtle on this but the filter allows the user to accentuate it nicely.
Three audio outputs
3U Eurorack module, 4 HP wide, 27 mm in depth
Power consumption: 30 mA at +12 V and 25 mA at -12 V