... if you're running a 32 bit OS, check to see if you've reached the "10 device midi limit in Windows XP".
I'm assuming that you're running XP... IIRC, this limit also applies to Win 7 32 bit.
I think that this applies to "USB-midi" devices... your midi interface, tranzport, alphatrack, padKontrol, etc etc and you can also reach the limit by plugging any devices into different USB ports than the one they were originally installed through.
This seems to be one of the best and reliable resources on this issue:
http://www.rme-audio.de/e...n_support_faq_10entryd Craig Anderton has also posted a useful article on it in the past.
If you're running a 32 bit OS, then go thru the instructions in the RME article, just to the point of seeing if all 10 device entries are full (in regedit, they run: midi, midi1, midi2 etc thru midi9).
If those are all listed, then you may want to follow through with the recommendations and exact instructions in the RME article AFTER appropriate registry backups, restore point, etc.
It's not as hairy as it sounds.
Only necessary if all 10 entries are there.
Strange, this morning I couldn't get Sonar to recognize my Tranzport. Midi entries were available (not full) in regedit, so I reinstalled the Tranzport software and Tranzport Sonar plugin. Solved my problem, but I looked in regedit first.
Hope that helps?
Rusty