Apple Logic Pro 8 - Manual (Page 814)

814 Chapter 35 Working With Surround
To change the bounce extensions:
1 Click the Bounce Extensions tab.
2 Click in any of the active fields, and type in the new extension name.
As examples: The default left extension “.L” could be renamed to “.Left”, or the left
surround extension “.Ls” could be changed to “.LSurr”. Don’t forget the period before
the extension!
If you change your mind, simply click the Reset Extensions button to revert to the
defaults.
Note: Changing the extension has no impact on the files—it simply makes them easier
to identify. If you find the defaults clear enough, there’s no need to change them.