The filter circuit is identical to the original design and uses the exact same schematic as the Polivoks synthesizer as well as new old stock Soviet integrated circuits (KR140UD1208 and KR140UD608, not Western "equivalents").
The filter's sound is very characteristic, aggressive, screamy and the self oscillation is absolutely not stable. Fans of the Wasp or MS-20 should like it.
Two audio inputs with level control spare you a mixer pre-filter.
Cutoff frequency is controleld with a big potentiometer and two CV inputs, the first of which has a polarizer as attenautor. The resonance is controllable manually only and goes to self-oscillation.
2 CV inputs for cutoff frequency, one with polarizer
2 audio inputs, low pass output, band pass output
3U Eurorack module, 10HP wide, approx. 30mm deep.