Thanks for the tip, and the offer.
I think I will still need my Quad IIc for the total of 8 direct MIDI OUT? Or can I get that with the STM32F4-to-BOB adapter board?
I don't have much space in this case I am making, so I am trying to do it with as little modules/components as possible (see image)
It just felt unnecessary to plug in and out 8 MIDI cables each time. A short serial cable will work great I think, also for when I detach the lid from the SEQ part and have them next to each other.