This Module is currently available.
Dual voltage-controlled State Variable Filter
SVFs is a dual voltage-controlled State Variable Filter. Each filter has 1 signal input, 2 control voltage inputs with one attenuverter, and 3 signal outputs: Lowpass, Highpass, and Bandpass.
When the resonance control is turned fully clockwise, the filter will self-oscillate, yielding a sine wave on the three outputs, 90 degrees out of phase with each other.
SVFs' signal inputs are DC coupled, so the filters can process both audio and control voltages. Great for making slewed and resonant envelopes and sequences.
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These merchants probably sell this module. Huh?