Apple Mac OS X Server v10.6 - Manual (Page 36)

Audio: AAC-LC Music, Mono, 24 kbps, 16 kHz
Podcast Composer lets you specify custom encoding formats that you create with the
Compressor application, which must be installed on the computer running Podcast
Composer and launched at least once before you can use it with Podcast Composer.
The Compressor application should also be installed on the Xgrid nodes used by
Podcast Producer to run the workflow.
Compressor is a post-production application. It ships with Final Cut Studio.
Note: Only a few default Compressor encodings are playable on an iPod or iPhone.
Before deploying a custom composition, be sure it fits the target device requirements.
36 Chapter 5 Configuring the Export Stage