Could you please take a stab at the Frostwave Resonator? It’s a copy of the Korg MS-20 filter section, so that’s the schematic I’m including. Obviously, some features aren’t there and I don’t know how hard they’d be to implement. Even just the high and lo pass filters would be great, though. Thank you!
https://www.gearbug.com/product_info/frostwave_the_resonator