Apple Logic Pro 9 - Manual (Page 1206)

Interleaved or Split Bounce File?
In some cases you might need to bounce to a different format than the one you’re
working with.
• Interleaved bounce: Bounce to Interleaved when you want to use the file in another
audio application that supports interleaved files (most audio applications or devices
do).
• Split channel bounce: Perform a split channel bounce when you want to use the file
in Pro Tools software, or another application that only supports the “split stereo”
format.
1206 Chapter 42 Working with Split Channel Audio File Formats