Apple Logic Pro 9 - Manual (Page 340)

Audio regions that point to compressed audio files are denoted by the following symbol:
Compressed audio file
symbol
To convert compressed AAC, MP3, and Apple Lossless audio files
Do one of the following:
µ
Select the audio regions pointing to an audio file in the Arrange area, then choose Audio
> Convert Regions to New Audio Files in the local Arrange area menu (or use the Convert
Regions to New Audio Files key command, default assignment: Option-Command-F).
The part of the audio file spanned by the audio region is converted to a new audio file.
µ
Select the audio files in the Audio Bin, then choose Audio File > Copy/Convert File(s) in
the local Audio Bin menu (which is also available by Control-clicking the Audio Bin or
using the corresponding key command).
Important: Compressed audio files protected by the DRM (Digital Rights Management)
scheme cannot be opened in Logic Pro. Depending on the type of music you buy from
the iTunes Store, you may have the option of buying DRM-free songs. Some songs are
only available in a DRM-protected format, while others are available in both formats.
Overview Calculation
When you add an audio file to your project, Logic Pro automatically creates an overview
of the audio file. This is a graphic file that is used to display the waveform.
Waveform overview
340 Chapter 11 Adding Prerecorded Media