Apple Logic Pro 7 - Manual (Page 289)

Chapter 6 Logic’s Mixing Facilities 289
Dithering
Dithering (see “Bouncing and POW-r Dithering” on page 84) is recommended when
bouncing 24 bit recordings into 16 bit files.
“Add to” Options
The Add to Audio window option adds the bounced PCM file(s) to the Audio window
The Add to iTunes library option adds the bounced PCM file to the iTunes library. Note
that iTunes does not support SDII. Should the file be in SDII format, this switch will be
disabled.
MP3 Options in the Bounce Dialog Window
Logic allows the bouncing of MP3 (MPEG-2-Layer-3) format files. This well-known data
reduction format for digital audio signals was developed by the Fraunhofer Institute,
and allows high compression rates while maintaining quite good audio quality
(depending on the compression rate). MP3 is the current standard for audio file
exchange via the Internet.
Due to the fact that encoding an MP3 file equates to a loss of audio quality, you should
not use MP3 files during production if you have access to the same audio data in linear
formats such as: AIFF, WAV, or SDII.
Bounced PCM file(s) is/are also used for encoding to MP3/AAC or burning a CD. It
should be noted that this occurs before dithering takes place.