Mutltimode filter with a 4-pole lowpass, a 2-pole lowpass and a 2-pole bandpass, all available simultaneously at individual outputs. Additionally there's a 4-pole low pass output with an integtrated VCA (GAIN input and LP>VCA output) that makes creating a compact subtractive voice very easy.
Self-oscillation is available for all modes and produces a clean sine-wave on the LP4 output. Unlike many classic 4-pole designs, this filter does not suffer from "loudness drop" when resonance is increased. The resonance loudness compensation circuit brings a slight tone coloration reminiscent of the Roland SH/Jupiter filters, with a very round and "liquid" resonance.
There are two CV inputs for the cutoff frequency - one with fixed 1V/octave and one (FM input) with polarizer. The resonance is voltage controllable as well.
One audio input. Four filter oututs: BP2, LP2, LP4, LP4>VCA
CV inputs: VCA-gain, resonance, cutoff 1V/octave (FREQ) and variable (FM)
3U Eurorack module, 8HP wide, 26mm deep
current draw: 35mA at +12V and 35mA at -12V