On 01/11/2007, at 9:20 AM, Wheaton, Simon wrote: > 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? Simon, I assume your Logic setups load up by default with some kind of autoload template? In this template go to the midi environment window and you will see a big object called "Physical Input" On this device you'll notice a cable node available for every midi input port - USB or midi - available on your systems. You'll notice that the top cable from "Sum" is connected through a keyborad and midi monitor object and then onto the "Sequencer Input". To stop any one of these "nodes" midi data from being passed to the Sequencer Input you simply connect it's specific node to a dummy midi object like a midi Monitor (created from the New Menu). Doing this takes that input only OUT of the Sum input. This is how you would achieve this task inside Logic. Otherwise you could use a separate program called MidiPipe <http://homepage.mac.com/ nicowald/SubtleSoft/> to hijack the required midi ports so Logic does not see them at all. Kind regards ::::::::::::::::::::::::::::::::::::::::::::::::::: Paul Najar Jaminajar Music Production www.jaminajar.com