Apple Logic Pro X - Manual (Page 851)

Chapter 25 Preferences, project settings, and key commands 851
Audio preferences
Devices preferences
Logic Pro automatically recognizes any installed Core Audio hardware, and uses the default
settings as defined in the Audio MIDI Setup utility (Applications/Utilities/Audio MIDI Setup).
However, you may want to optimize the settings for your individual hardware setup, particularly
if you use several audio interfaces or a multiple input/output device.
The Devices pane contains the following preferences:
•
Core Audio Enabled checkbox: Enables the Core Audio driver.
•
System Memory Requirement display: Indicates the amount of free RAM required, outside of
memory assigned to Logic Pro. The requirement value changes as you alter the preferences
within this pane.
•
Output Device pop-up menu: Use to choose between any installed Core Audio device, including
the internal sound hardware. This also includes aggregate audio devices, consisting of several
audio interfaces. See the Audio MIDI Setup Help for information on aggregate devices.
•
Input Device pop-up menu: Use to choose between any installed Core Audio device, including
the internal sound hardware. This also includes aggregate audio devices, consisting of several
audio interfaces. See the Audio MIDI Setup Help for information on aggregate devices.
Note: When setting an output device that also provides inputs, the Input Device pop-up menu
changes accordingly. If choosing a different input device, you’ll be advised to use a common
Word Clock for both audio devices, in order to ensure the best sound quality.
•
I/O Buffer Size pop-up menu: Determines the size of the buffer used by the audio hardware for
both input and output. The smaller the buffer size, the less latency you will encounter when
monitoring while recording, or using software instruments.
Some points to note:
•
As the value is reduced, a higher strain is placed on your computer’s processor or processors.
•
There may be a point where the selected I/O buffer size is too small for your computer,
and begins to affect playback. This usually takes the form of clicks, pops, and crackles in
your audio.
•
You should aim for the lowest possible I/O buffer size value that doesn’t introduce clicks,
pops, and crackles in your audio.