Apple Logic Express 9 - Manual (Page 843)

Adding Acid Loops to the Loop Browser
The Loop Browser also displays Acid Loops. Acid Loops don’t contain tags like Apple Loops.
In Acid Loops, this information is derived from the surrounding folder structure (especially
the names of folders), which must comply with certain standards. This means that it’s not
possible to drag an individual Acid Loops file into the Loop Browser.
As such, you need to drag the entire CD (or folder) that contains the Acid Loops into the
Loop Browser.
Using Global Tracks with Apple Loops
You can use the global tracks to change global events such as time signature and key
during a project. The following section summarizes how these changes in the global
tracks affect the playback of Apple Loops. Exceptions are the Tempo and Beat Mapping
Tracks, as Apple Loops adjust automatically to the tempo of these tracks.
Using the Signature Track with Apple Loops
Apple Loops can contain information about their original key, and can be transposed
automatically. They are played back at the project key by default, which is defined by the
first key signature event. No distinction is made between major and minor keys for these
global transposition functions; in fact, only the root of the initial key signature is relevant
for playback of Apple Loops.
Note: When you change the key signature after importing Apple Loops, the playback of
SIALs is not affected. They behave like normal MIDI regions. The playback of MIDI regions
is not affected by key signature changes, only the display in the Score Editor.
The playback transposition for Apple Loops is controlled by the root note of chords in
the Chord track. These root notes determine the global playback transposition—relative
to the current key signature—shown in the Signature track. If no chords are available in
the Chord track, the global playback key for Apple Loops is determined by the very first
key signature in the Signature track (default: C major).
Using the Chord Track with Apple Loops
The root notes of chords in the Chord track determine the transposition (pitch shifting)
of all Apple Loops.
843 Chapter 30 Creating Apple Loops