I make all the modification you want. Test it and tell me if that work with your computer. Perhaps we must enlarge computer testing with other list=3F Sometimes the midi=5Fserver crash. I will see that very quickly. That publish MidiEndpoint with suffix "=5FOBOS" In my home that work with MidiPlayer, MidiKeyboard and Alesis QS Editor The URL for the source are : http://jerome.leveque.free.fr/ Midi=5FDrivers.zip A+ Jerome