Hi, thanks for the reply, but the iMac is brand new running OS 10.8 with the MIDI interface being a MOTU 128 express with the latest driver that says its OK for 10.8. I have managed to record two cords in Cubase that when I play back hangs on two notes, I was looking to see if I can find note on and note off information to see if the problem is the note off signal being missing but I don’t think Cubase shows this detail. Thanks.