This Module is currently available.
Adaptation of 1973 State Variable Filter by Serge
The CGS77 is Lower West Side Studio's version of Ken Stone’s licensed adaptation of the Serge ’73 VCF.
The CGS77 is a State Variable filter featuring 3 simultaneous outputs; Lowpass (12dB/Oct), Bandpass (6dB/Oct) and Highpass(12dB/Oct)
2 control voltage inputs are provided with an attenuverter on one input. The filter can be pinged by a low frequency pulse wave or Trigger.
The CGS77 comes in a 1U width form factor with 25mm(1″) knobs controlling 4 potentiometers
These merchants probably sell this module. Huh?