[SOLVED] MIDI connection on Raspberry PI - All device connected

[ToFFmashines]

Hi @jean-emmanuel,
stop investigation in this point.

The real culprit is amidiauto, which is working as a background process on PatchBox OS.
The solution is to turn it off by

sudo systemctl stop amidiauto
sudo systemctl disable amidiauto

Or replace it using the Amidiminder utility. GitHub - mzero/amidiminder: ALSA utility to keep your MIDI devices connected

@jean-emmanuel thanks for your work on OSC.