10.6

Table Of Contents
876Logic Pro User Guide
When you click MP3 in the Destination area, the following options are available:
Bit Rate (Mono/Stereo) pop-up menus: MP3 bit rates are available between 32kbps
and 320kbps, but default to 80kbps mono, and 160kbps stereo. These rates offer
acceptable quality and good file compression.
For enhanced audio quality, you can choose:
96kbps for mono streams
192kbps for stereo streams
You can choose higher rates, but the quality improvement afforded by bit rates above
96/192kbps is nominal. Note that the higher the bit rate, the larger the file size of the
bounced file.
Use Variable Bit Rate Encoding (VBR) checkbox: Variable Bit Rate encoding compresses
simpler passages more heavily than passages that are (more) harmonically rich,
generally resulting in better quality MP3 files.
Because not all media players can accurately decode VBR-encoded files, this option is
off by default. If you know that your target listeners can decode VBR-encoded files, you
can turn this option on.
Quality pop-up menu: Keep this set to Highest (the default) whenever possible.
Reducing the quality shortens the conversion process, but at the expense of audio
quality.
“Use best encoding” checkbox: Like the Quality parameter, if you deselect this option,
you shorten the time needed to bounce the file at the price of audio quality. This should
always be selected, unless conversion time is an issue.
“Filter frequencies below 10Hz” checkbox: When this option is selected, frequencies
below 10Hz (which usually aren’t reproduced by speakers, and aren’t audible to
human ears at any rate) are removed. This leaves slightly more data bandwidth for the
frequencies that are audible, resulting in an improvement of the perceived quality. Only
deselect this option if you’re experimenting with subsonic test tones.
Stereo Mode pop-up menu: Choose Joint Stereo or Normal stereo mode. Depending
on the original file, these settings may (or may not) offer any audible difference.
Experiment with both settings to see which provides better results.