This has been described extensively elsewhere, but I was unable to find an actual bug submission for the issue. Midi input is working fine for all other applications (e.g. Logic Pro), but not for Frescobaldi. I’d be glad to help diagnose the issue, and suspect that it may be configuration-related.

I have tried restarting Frescobaldi, rebooting the machine itself. shutting off all other apps that listen to midi, etc.

Frescobaldi: 4.0.3
Extension API: 0.9.0
Python: 3.12.8
python-ly: 0.9.9
Qt: 6.9.0
PyQt: 6.9.0
qpageview: 1.0.0
OS: macOS-15.3.1-arm64-arm-64bit
installation kind: standalone .app bundle