Well done, Christophe.? I have many ideas like that one, but they rarely end up actually getting built :)
I agree with Antoine - DIP switches aren't ideal, not only for ergonomics but because they are not normally rated for frequent use.?
For example, the Yamaha WX5 uses them to set options (on boot) but it advises in the manual that they are not meant to be changed frequently.? DIP switches are notorious for failing, if they're used a lot.
Maybe you could break out the switching section to a separate board, e.g. via a header and an optional IDC cable, so people could provide their own solution - that's the easy bit.? I think most of us could handle doing that, with a bit of advice from other members.
I only have a TX7, and they didn't provide a cartridge slot, so I can't use one, unfortunately.? It would be nice though.? I've debated whether it's worth the effort to design an Arduino based sysex librarian module to send a bank to it, based on Bank Select messages, for example.?? Maybe one day...
FWIW, I've (hopefully) attached a bank I've made with my favourite Piano, EP and Clav sounds from the official 1a-4b DX7 cartridges, plus a few from another source.? I cheated a bit and used some of the cartridge guitar patches too, because some make quite nice clavs, to my ear.
Andy
AndyHornBlower