I have been using a US 122 Tascam for a couple of years and always had problems with the midi changing notes (you play c, you hear b), especially when you get to the third or fourth midi track. I always thought it was my computer, but now with the new iMac 17" 2 gig processor I am having the same problems in a different simple program, Garage Band.

Has anyone out there hear of this problem or have any idea what it could be about?

I have talked to Tascam support about this and they are so in denial about anything ever being wrong with their product, almost as bad as the folks at Final Draft, that they had me running around checking evedrything else.

As a control I switched off the US122 as audio I/O and the problem stopped!