Apple Logic (1.1) - Manual (Page 57)

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Audio Regions
Logic allows you to record not only MIDI data, but also
audio parts. This enables you to integrate acoustic
instrument or vocal performances into your songs. More
on this can be found in the following chapter.
As with MIDI recordings, audio recordings are made and displayed in the Arrange
window on tracks. These are Audio, rather than MIDI tracks. Once captured, audio
recordings can be mixed and processed with realtime effects.
Important: Audio recordings are referred to as Audio Regions in the Arrange window,
and they look very similar to MIDI Regions. Audio Regions are actually visible portions
of audio files. When you cut or resize an Audio Region in the Arrange window, the
audio file itself is not cut or resized. The Audio Region that you see is a visual
representation of a part (or all) of the audio file, and changes that you make to it in the
Arrange window simply instruct Logic on how to play the audio file. In other words, the
Audio Regions are simply “pointers” to the underlying audio file.
Although the handling of Audio Regions and MIDI Regions is similar in Logic, it is not
exactly the same. As a result, the editing and parameter options available for MIDI and
Audio Regions are slightly different.
Note: Audio Regions are, in general, less flexible than MIDI Regions. As examples, they
can not be transposed, and have a fixed playback speed. This isn’t true for Apple Loops
files, however. These types of audio files may be transposed and played back at varying
speeds, without pitch alterations.
Please reload the Tutorial song for more exercises.