10.6

Table Of Contents
875Logic Pro User Guide
The Logic Pro > Preferences > Audio > I/O Assignments pane gives you access to the
surround settings.
You set the stereo and surround output formats in the Output pane.
The Bounce Extensions pane displays the extensions that are added to the filenames
resulting from a stereo or surround bounce. Select the various fields to edit the
extensions.
You set the stereo and surround input formats in the Input pane.
Note: Selecting the Surround Bounce option deselects the MP3, M4A:AAC, and Burn
checkboxes in the Destination pane if they’re selected.
Add to Project checkbox: Adds the bounced PCM file to the Project Audio Browser.
Add to Music checkbox: Check this box if you want to add the .m4a file to your Music
library.
Note: If your Mac is running macOS Mojave or earlier, an “Add to iTunes” checkbox
replaces the “Add to Music” checkbox.
MP3 bounce options in Logic Pro
You can bounce projects to MP3 (MPEG-2, Audio Layer 3) format files. The MP3 format
was developed by the Fraunhofer Institute, and allows high compression rates while
maintaining reasonable audio quality. MP3 is a widely used standard for audio file exchange
over the Internet.
Because the MP3 file format involves a loss of audio quality, you shouldn’t use MP3 files
during production if you have access to the same audio data in non-lossy formats such as
AIFF or WAV.
Bounced PCM files are also used for encoding to MP3/M4A. Note that this occurs before
dithering takes place.
Note: The MP3 format doesn’t support sampling rates higher than 48kHz. If the selected
sample rate is higher than 48kHz, a temporary copy of the PCM file (with a 48kHz sample
rate) is created before the project is bounced to MP3 format.
If PCM is unselected in the Destination area of the Bounce dialog, a temporary PCM file
is created and used as a source for bouncing to MP3 or M4A, or for burning to a CD
(depending on which options are selected).
Selecting the MP3 option in the Destination area automatically disables the PCM >
Surround option. This is because the MP3 format doesn’t support surround. However, Split
Stereo format is possible, even if the encoded MP3 file is set to Joint Stereo mode.