Dual VCF (Voltage Controller Filter) module
This module houses two filters, the first one (on the left) is a state variable biquad, 12dB/octave multiple output filter. It has simultaneous lowpass, bandpass and highpass outputs. In addition to resonance and filter cutoff frequency controls it has a switch that defines the frequency cutoff range. The second filter (on the right) is a more traditional Moog style low pass filter with a slope of 24dB/octave. The resonance control can lead to oscillation (a nice sine wave).