Apple Logic Express 7 - Manual (Page 271)

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Audio Drivers
To use particular audio hardware with Logic, the
hardware’s driver needs to be activated and configured
correctly. This chapter explains how this is done.
Drivers are software programs used to enable various pieces of hardware and software.
This allows them to be recognized by other computer programs, and to have the
appropriate data routed to and from them, in a format they can understand.
Selecting, activating, and configuring a particular audio driver in Logic is achieved via
the Audio > Audio Hardware and Drivers dialogs.
The Audio Hardware and Drivers Dialog
In Mac OS X, all audio devices are accessed via Core Audio, an integral part of the
operating system. Core Audio is a flexible, high-performance, low-latency audio system,
which allows access to multiple audio hardware devices from several audio applications
at the same time. Logic is compatible with any audio hardware which has a Core Audio
driver. All information about using Logic with Core Audio hardware can be found in the
following section.
Core Audio
Logic automatically recognizes any installed Core Audio hardware, and will use the
default settings—defined in Mac OS X’s Audio MIDI Setup utility (Applications >
Utilities > Audio MIDI Setup). It can, however, be advantageous to optimize the settings
for your individual hardware setup, particularly if you use several sound cards or a multi
I/O card. This can be done in Logic’s Core Audio pane, which offers the following
options: