Apple Logic Express 7 - Manual (Page 209)

Chapter 6 Logic’s Mixing Facilities 209
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.
Use
These radio buttons allow you to select either a mono or stereo output file.
Options
The Options switch launches the MPEG-4 Audio Compressor window, discussed below.
MPEG-4 Audio Compressor Window
Compressor
Selects the compression encoder. By default, this is AAC (Low Complexity).
Bit Rate
A number of predefined bit rates are available in this pop-up menu, ranging from 16
kbits/second to 320 kbits/second.
Output Sample Rate
A number of predefined sample rates are available in this pop-up menu, ranging from
8000 kHz to 48,000 kHz. The Recommended option selects a default option, based on
other encoder choices you have made.
Encoder Quality
Keep this set to Best whenever possible. Reducing the quality will speed up the
conversion process, but at the expense of audio quality.