Apple Logic Pro 9 - Manual (Page 25)

Audio Regions and Audio Files
Audio regions refer to (point to) an underlying audio file. Audio regions are used as
playback markers (start and end points) that can be as long as the entire audio file, or
only a few seconds long, playing a small portion of the audio file that they point to.
Audio region 1
Audio file
Audio region 2
Audio
region 3
Any audio file used in Logic Pro is automatically linked to at least one audio region that
is, by default, the length of the entire audio file.
You can freely create as many audio regions as you require. For example, imagine a live
stereo drum track that runs for the duration of your project. During the second chorus,
the drummer played perfectly, but was a little sloppy during all other chorus sections.
Logic Pro allows you to create an audio region that points to the second chorus section
of the overall (drum track) audio file, and use this perfect take in multiple places in the
project.
You do this by creating one audio region (that points to chorus 2 in the drum track audio
file), and copying it to each position that the chorus occurs in the Arrange area.
A great benefit of working with audio regions, rather than audio files, is that they use
very little memory, whereas multiple copies of the same section of the audio file would
require a lot of hard disk storage space.
It is, of course, possible to directly edit, copy, and move audio files. You do this in the
Sample Editor and Media area.
25 Chapter 1 Introducing Logic Pro