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Logic Pro 9 User Manual - Help Library - Apple

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MIDI Interface<br />

Your Mac computer does not provide MIDI inputs or outputs. If you want to use MIDI<br />

devices equipped with MIDI ports, a MIDI interface is required for communication with<br />

your computer. MIDI interfaces are generally connected to your Mac USB ports. Some<br />

MIDI interfaces require the installation of driver software, and others are automatically<br />

recognized by your Mac.<br />

Note: Many modern MIDI devices, particularly keyboards, include a USB or FireWire<br />

connection port that enables MIDI (and audio, in some cases) communication with your<br />

computer. Such devices do not require an additional MIDI (or audio) interface. Some<br />

require the installation of driver software, and others are automatically recognized by<br />

Mac OS X. Check the websites of MIDI device manufacturers for further information.<br />

Types of MIDI Devices<br />

A vast array of MIDI-equipped devices exist. These include MIDI keyboards and sound<br />

modules, control surfaces, effect processors, mixers, lighting controllers, and more.<br />

MIDI Keyboard<br />

The most likely candidate for inclusion in your <strong>Logic</strong> <strong>Pro</strong> system is a MIDI keyboard. MIDI<br />

keyboards are used to input note (and controller) information into <strong>Logic</strong> <strong>Pro</strong>. Some MIDI<br />

keyboards are simply input devices (often called controller keyboards) and some also<br />

include their own synthesis engines (synthesizer and sampling keyboards). <strong>Logic</strong> <strong>Pro</strong> can<br />

be used to record keyboard performances as MIDI data, and can play them back through<br />

any connected MIDI device or internal software instrument.<br />

If you don’t have a MIDI keyboard handy, <strong>Logic</strong> <strong>Pro</strong> offers the Caps Lock Keyboard, which<br />

allows you to use the computer keyboard for MIDI note entry. See Using the Caps Lock<br />

Keyboard for MIDI Step Input.<br />

Control Surfaces<br />

Control surfaces are hardware devices that feature a variety of controls, which can include<br />

faders, rotary knobs, switches, and displays. These controls can be mapped to functions<br />

in <strong>Logic</strong> <strong>Pro</strong>, allowing you to change parameters with more precision and speed than<br />

you can by using your mouse and computer keyboard. You can also control multiple<br />

parameters at the same time. Detailed information on the setup and use of control surfaces<br />

can be found in the <strong>Logic</strong> <strong>Pro</strong> Control Surfaces Support manual.<br />

Recording Light Plug-in<br />

<strong>Logic</strong> <strong>Pro</strong> facilitates the use of a control surface plug-in, called the Recording Light, to<br />

control an external device via MIDI events. This allows you to control an external recording<br />

light or sign, warning visitors not to enter the recording studio before or during recording.<br />

<strong>Logic</strong> <strong>Pro</strong> sends a MIDI signal to turn on the external device when a track is record-enabled<br />

or when recording starts. <strong>Logic</strong> <strong>Pro</strong> sends another MIDI signal to turn off the device when<br />

tracks are made record-safe or when recording stops.<br />

30 Chapter 2 Setting Up Your System

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