The A-105 bases on the patented so-called "true open loop design" which generates a very fat sound. The filter works with a slope of -24dB per octave and provides voltage controllable resonance up to self-oscillation. The audio input is sensitive so you can distort the audio signal at the input if desired. there´s a volume control at the audio input, potentiometers for setting the cutoff frequency and resonance as well as attenuators at the CV inputs for cutoff and resonance.
Audio input, audio output
two cutoff CV inputs: 1x 1V/octave, 1x with attenautor
resonance CV input with attenuator
3U Eurorack module, 8HP wide, 41mm deep
current draw: 30mA