Apple Soundtrack - Manual (Page 173)

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Using Apple Loops Utility
Some audio files you use in Soundtrack can include metadata called tags. Tags provide
information about the audio recorded in a file. Soundtrack uses tags in one of two ways:
 To help locate files using the Search feature in Soundtrack
 To provide information that Soundtrack uses when matching the file’s tempo and key
to the project tempo and key, for the best possible playback quality
Both AIFF and WAV file formats can include tags. Libraries of audio files created for use
with loop-based music software are usually tagged, and Soundtrack recognizes the
tags used in most popular file formats.
What Is Apple Loops Utility?
Apple Loops Utility is a companion application to Soundtrack that you can use to view
and manage tags in audio files. You can add and change tags using Apple Loops Utility;
you can also tag multiple files, a process known as batch tagging.
Apple Loops Utility can read both AIFF and WAV file formats. When you save changes
you make to either type of file, the file is saved as an AIFF file, the default file format for
Soundtrack. The set of tags you can work with using Apple Loops Utility includes all of
the tags in WAV files tagged for use with Sony’s ACID music application, as well as
additional tags.
Tagged audio files can also contain information about transients. Transients indicate
where beats occur in the file, and Soundtrack uses transients to play back audio files at
the highest level of quality. Apple Loops Utility can detect transients present in an
audio file, and you can use Apple Loops Utility to add markers for additional transients
and move them to new locations.