Hi, this looks killer, and great that it works well with the pisound box.
For such projects, I would head straight to the Teensy department - those make for wonderful USB MIDI devices - no pain at all!
And as for code Librares, the Control_Surface lib by Pieter P that you mentioned looks overly exhausting for literally anything you’d want to have on a controller box. I haven’t used it but I would if i was to build such a thing. Esp. filtering the analog pots, removing jitter, debouncing the switches … all this is nice if solved one for all, and we users need not bother about them anymore.
Bests, Hannes
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