DIY Steiner Multimode Filter

This is a Steiner Multimode Filter inspired by the Steiner-Parker Synthacon VCF, resp. CGS Ken Stone.
HighPass, BandPass, Lowpass levelpots to the left,
Frequency, CV and Resonance pots to the right.

• ? mA +12V
• ? mA -12V
• ? mA 5V
• 50 mm Depth

No info about availability.