If they are SC-88 Pro files: I had this too. I think some effects in those MIDI files (NRPN/Sysex) causes it. It's with SC-88 Pro files only as far as I'm aware.

Rawit wrote on 2025-05-18, 11:08:

If they are SC-88 Pro files: I had this too. I think some effects in those MIDI files (NRPN/Sysex) causes it. It's with SC-88 Pro files only as far as I'm aware.

I'm glad it's not just me! Were you able to find a midi file that causes this? because it definitely smells like a bug.

It's not a bug; it just happens to be the X16GS responds to SC88 Pro insertion effects commands in a different way.