Doepfer A-110-1 Standard-VCO death-by-audio and you can use the

and you can use the PRE/POST EQ switch to set whether or not your Direct Out signal is affected by the Bass Preamp’s EQ section

The QCD Expander is 12HP and 0

The Blend knob lets you control how much of the fuzz tone is mixed with the two octaves down signal

About The Vitruvian Mod:

Doepfer A-110-1 Standard-VCO death-by-audio and you can use theModule A 110 1 is a voltage controlled oscillator. This VCO's frequency range is about eight octaves (ca. 15Hz 8kHz). It can produce four waveforms simultaneously: rectangle, sawtooth, triangle, and sine wave (triangle and sine shapes are not perfect, see remark below). The output levels are typically 8Vpp for saw and rectangle, and 10Vpp for triangle and sine. The frequency or pitch of the VCO is determined by the position of the octave (Range)