Hi, That's really simply (perhaps too=3F) this version use write/read for sending/receiving midi data to hardware. that work, you can see result here : http://jerome.leveque.free.fr/ Midi=5FDrivers.zip todo list(not good order) - Adding good icon for Patchbay - Automatic creation for all entry in /dev/midi/ - Not just getting data from hardware but sending it to connected endpoint - Checking error - correcting bug - any other idea... A+ Jerome