Apple Logic Pro 9 - Manual (Page 346)

Audio Regions and Audio Files
Audio regions simply refer to (point to) an underlying audio file. Audio regions are merely
used as playback markers (start and end points) that can be as long as the entire audio
file, or may only be a few seconds long, playing a small portion of the audio file that the
(region) start and end markers encompass.
Audio region 1
Audio file
Audio region 2
Audio
region 3
Any audio file used in Logic Pro (added to the project, and therefore the Audio Bin) is
automatically linked to at least one audio region that defaults to the length of the entire
audio file.
Audio regions contain a temporal reference point called the anchor. When you move an
audio region, it’s not the start point that is displayed in the help tag (as with MIDI
regions)—it’s the anchor point.
You can freely create as many audio regions as needed. To give you an example of where
this may be useful, 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.
346 Chapter 12 Getting to Know Regions