Hi, nice project.
I planing to build something similar, or.... actually completely different but the same HW can be used.
I´ve got an old upright piano im going to kill and midify using piezo-buzzers (piano hammers on buzzers), so im a curious how you managed to connect the buzzers to the ain-module?
Haven´t been visiting in this forum for several year (build a sid-unit around 8-10 years ago) so im not very updated on what have happened in the midibox world since then. But it sure looks like Thorsten has been buisy. :D
Btw a tip for your project (or at least a prototype) get your hands on an old (used cheap) playstation drumset, it´s nice for a first set of pads until everything works as intended. I´ve got one and connected the pads to an old drum module with midi out (i bit lazy compaired to you ;-))
Best regards
skov
(from denmark)