Has anyone ever built a fixed filter bank at all? (Or any kind of filter bank.)
http://yusynth.net/Modular/EN/BANK/index.html (http://yusynth.net/Modular/EN/BANK/index.html)
I suspect swearing will be needed to Euro-fy this. And layered boards -- one board for the pots and jacks (maybe two, depending on pot spacing), and another board for the actual filter ICs. (SMD, to fit the damn things on a 100mm x 80mm board.)
This looks like an awesome project, good luck.
The bug has bitten, deep....