Congrats from a fellow MS-20 Mini owner.
So far all I’ve done with it is make drone/ambient stuff and mess around with self-generating noises - no real attempts at sequencing yet. I might just sequence via MIDI from the Octatrack. I’ve heard of various workarounds for the limited MIDI implementation of the MS-20 Mini (only responds to MIDI note number - that’s it) - one idea I might explore is using my KMI QuNexus as a MIDI-CV converter, with the QuNexus CV used for modulation rather than pitch. Thus:
OT -> MS-20 for pitch only (MIDI note number)
OT-> QuNexus -> MS-20 for modulation or even just gate, so filter activity or whatever is in sync w/ the OT.