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Logic Pro 7.1 – MIDI Setup (2005-0905) 3 of 13

CoreMIDI

Once the MIDI message enters your computer via the USB cable from your MIDI interface, OSX takes over with its CoreMIDI technology. Having

CoreMIDI as part of the operating systems guarantees an optimum of compatibility between different MIDI components both Hardware and Software.

In the old days, OS9 didn’t understand MIDI on the system level, so there were different technologies (FreeMIDI, OMS, etc), which made it, work. But

different devices worked only with specific protocols and compatibility was not always guaranteed.

Every Software or Hardware developer who creates a product for OSX that handles MIDI has to make it only compatible with CoreMIDI and therefore is

automatically compatible to all the other products following the same CoreMIDI implementations. The advantage for the user is a hustle-free build in

MIDI compatibility in OSX.

Audio MIDI Setup (AMS)

There is only one central utility application named “Audio MIDI Setup” which handles the MIDI configuration for your computer. (The utility contains

also the setup for its sibling “CoreAudio”.)

•

Any hardware

that sends/receives MIDI messages to and from the computer needs a driver (a little piece of software), placed into the

“

Library/Audio/MIDI Drivers”

directory during the installation. The driver makes the hardware visible in the AMS. The hardware could be a

regular MIDI interface connected via USB, a MIDI keyboard connected directly to the USB port, or any other device, with a MIDI interface

connects via PCI card or FireWire cable.

•

Any software

that handles MIDI messages (i.e. a sequencer) gets their information from AMS. MIDI software however use different parts of

information from the AMS. Logic and ProTools lookup most of the AMS configuration and make them available right in their program where

Cubase kind of ignores most of the user setup and looks up only the driver. This is a poor implementation, because you have to reconfigure

your MIDI setup in your application again even if it is already available in the AMS. (This reflects a little bit the old “PC mindset” of Cubase

where each application exists in their own environment and isn’t able to share recourses. Compare the management of plug-ins under

Windows vs OSX and you know what I mean)

User Setup:

AMS provides a graphical user interface that enables you to create the MIDI signal flow based on how you hooked up your MIDI devices. If your

sequencer software is smart enough, then it will provide that setting in its own environment. You can even store different configuration in AMS for

different workflows or hardware setups.

Below is an example of the MIDI signal flow and the centralized role of the AMS:

• All the MIDI synthesizer are connected vie MIDI cable to the MIDI out of your MIDI interface

• The MIDI Keyboard is connected via a MIDI cable to the MIDI in of your MIDI interface

• The MIDI Interface is connected via USB to the computer

• AMS detects the connected MIDI Interface through its driver

• Logic retrieves the MIDI configuration from AMS on startup and makes the devices available in the Environment

• AMS can route MIDI messages from the “outside” (external MIDI devices) and from the “inside” (from Logic) through its Ethernet port. This

makes sending and receiving MIDI messages over the network to/from other networked MIDI system possible.

Logic

Audio MIDI Setup

Driver

USB

Ethernet

Synth-1

Synth-2

Synth-3

Kbd

/Library/Audio/MIDI Drivers

/Applications/Utilities/Audio MIDI Setup

/Applications/Logic Pro

Logic

Audio MIDI Setup

Driver

USB

Ethernet

Synth-1

Synth-2

Synth-3

Kbd

MIDI Interface

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