An update on the Novation Launchpad Mini experiment: I got the devices today.   The adaption shouldn't be so difficult, although we will miss the second half of the original BLM16x16+X, and MBSEQ will also be loaded much more due to the poor LED control protocol (even the "optimized" solution is multiple times slower than my own protocol, especially when LED rows should be updated vertically). However, since it's a USB MIDI connection, we would probably never noticed this...   But I've also