The M-Audio MobilePre/Sonica/Transit/Ozone devices need a firmware download before they can be used with Linux. I've released a first beta of the madfu-firmware package which tries to accomplish this. Please note that I do not have any of these devices, and that the loader is not tested at all. That's why I'm searching for volunteers. :-) To download the beta, go to http://sourceforge.net/project/showfiles.php?group_id=87777&release_id=183375 Please send any success/failure reports to usb-midi-fw-user@xxxxxxxxxxxx Regards, Clemens