Apple Logic Pro 7 - Manual (Page 292)

292 Chapter 6 Logic’s Mixing Facilities
AAC Format Options
The AAC options are not directly available in the Bounce Dialog window (due to a
limitation in QuickTime), with the exception of the Add to iTunes library option which
adds the encoded AAC file to the iTunes library.
You first need to type in a file name, and press the Bounce button before you can
access the AAC (Sound Settings and Options > MPEG-4 Audio Compressor) options.
When enabled, AAC disables PCM > Surround (following a warning message). Split
Stereo is, however, possible.
Should the selected sample rate be higher than 48 kHz, a copy of the bounced PCM file
is created—with an automatic sample rate conversion to 48 kHz before encoding. This
conversion takes place because the AAC format does not support sampling rates
higher than 48 kHz.
AAC Sound Settings
Compressor
Selects the compression algorithm used for AAC encoding. By default, this is MPEG-4
Audio.
Rate
A number of predefined sample rates are available in this pop-up menu, ranging from
8000 kHz to 48,000 kHz.
Size
These radio buttons allow you to select either an 8 or 16 bit output file.