Available as an assembled Module and as a DIY project.
This Module is currently available.
State Variable 2-Pole Filter
The 1973 VCF is a state variable 2-pole resonant filter that offers lowpass, bandpass and highpass outputs simultaneously.
https://prismcircuits.net/products/serge-1973-vcf
Included in 264 Racks, 121 are public: