Comment 11 for bug 1131460

As I said, Mixxx just uses the PortMIDI library to discover and communicate with devices. If it's not behaving as other apps do, then I would suggest you file a bug with PortMIDI here http://sourceforge.net/apps/trac/portmedia/report Though they don't seem to be responsive there, I would still file it there for the record, then post to their mailing list for discussion.