Nice program you have written, Serge :) Made with Delphi, isn't it. Maybe I can help when you need it, I've done much Delphi in the past :) Anyway, does this program handshakes with the MB64? I sent sysex to the MB, and the program counted down to zero. But the right config is not in the MB, so I think it didn't receive the sysex. Do I have to put the MB in a certain modus?