MIDI 2.0

[Bes]

https://www.midi.org/midi-articles/midi ... developers

...
Mike Kent, chair of the MIDI 2 Working Group, his partner Michael Loh, chair of the OS API Working Group, Andrew Mee, recently elected Technical Standard Board member and Chair of the Developer Support Working group, and Franz Detro of Native Instruments formed a consortium of individuals whose aim is to promote the adoption of MIDI 2.0 by providing tools and libraries useful to developers.

Resources include C++ Libraries, USB helpers, testing applications, and more

LINK These are available under permissive open-source licenses.

[Bes]

i'm no developer and i don't know if this is helpful here at all. MIDI 2.0 might be pretty good tho