Apple Logic Pro 9 - Manual (Page 43)

Using External Audio Effects
If you want to send audio to an external (MIDI-controlled) audio effect device, you need
to insert the I/O (In/Out) plug-in into one of the Insert slots of the audio channel strip
you want to process. For further information, see
Working with External Audio Effects .
Note: It is only practical to use the In/Out plug-in for external device routing when you
have an audio interface equipped with multiple in and out ports.
Configuring Your Audio Hardware
To use particular audio interfaces with Logic Pro, the driver for the device needs to be
installed, activated, and configured correctly. Drivers are software programs that enable
various pieces of hardware and software to be used with Mac OS X. This allows the device
to be recognized by applications, such as Logic Pro, and enables data routing between
software and hardware, in a format understood by both.
You select, activate, and configure a particular audio driver in Logic Pro in the Audio
Devices preferences.
To open the Audio Devices preferences
Do one of the following:
µ
Choose Logic Pro > Preferences > Audio (or use the Open Audio Preferences key
command), then click the Devices tab.
43 Chapter 2 Setting Up Your System