I have a lab at the school where I work that is running Logic Studio on 25 Intel Mac Pros. Each workstation has an external USB MIDI Interface (Emagic MT-4 or Edirol UM-3EX), which is connected to a MIDI Keyboard and external synthesizer. The problem is that some of the workstations (10 of the 25) have an M-Audio Axiom49 MIDI Keyboard that is connected to the external USB MIDI Interface by MIDI cables, but is also connected to the workstation directly by USB to provide power to the keyboard. This causes double notes being input into Logic, as the M-Audio keyboards are sending MIDI notes through the MIDI cable to the external USB MIDI Interface, as well as directly through the USB connection to the computer (via the USB MIDI interface built into the M-Audio keyboard itself). I want all the workstations in the room to communicate over MIDI cables, through the external USB MIDI interfaces. One solution would be to power all the M-Audio MIDI keyboards via external power adapters rather than by USB, but I would rather not have to buy these power adapters. I can't see anywhere in the Apple Audio MIDI Setup utility where I can remove/delete/disable the auto-detected USB MIDI interface that is built into the M-Audio keyboards, and I can't see anyway of blocking this MIDI data within Logic. Any ideas on how to remove this USB MIDI interface from Audio MIDI setup, or to block the data from within Logic? Thanks, Simon Canberra AUSTRALIA ----------------------------------------------------------------------- This email, and any attachments, may be confidential and also privileged. If you are not the intended recipient, please notify the sender and delete all copies of this transmission along with any attachments immediately. You should not copy or use it for any purpose, nor disclose its contents to any other person. -----------------------------------------------------------------------