Specifications

Chapter 8 Using Apple Loops 67
If you want to create a looped Apple Loop from an audio file that does not match the
song tempo, you should use the Apple Loops Utility. The Apple Loops Utility allows you
to define the intended length of the loop, regardless of the song tempo, by setting the
Number of Beats and Time Signature tag manually. Please note that the utility only
works with Audio Regions—not with MIDI regions on Audio Instrument tracks. For
further information about the Apple Loops Utility, see “Creating Apple Loops in the
Apple Loops Utility” on page 68.
You can also adjust the song tempo to the file length. Logic Pro offers an automatic
function that matches the length of an Audio Region with the intended musical length.
The length of the Region remains constant, but the sequencer tempo is varied
automatically, with the Region playing back at the intended length.
To adjust the song tempo to an audio file:
1 Create an Audio Region that spans the complete audio file.
2 Construct a cycle in the Arrange window Bar Ruler. Set the length to match the
intended musical length of the Region. As an example: If the Audio Region is one bar
long, set a cycle length of one bar.
3 Do one of the following:
 Choose Options > Tempo > “Adjust Tempo using Region Length and Locators” from
the main menu bar.
 Use the “Adjust Tempo using Region Length and Locators” key command (default key
command assignment: Command-T).
The tempo is recalculated, the Region (and the referenced audio file) matches the song
tempo.
Send Effects in Software Instrument Apple Loops
If you create a SIAL from a Region on an Audio Instrument track that uses sends to bus
effects, and then drag the saved loop to another (empty) Audio Instrument track, the
new loop will sound different to the original source Region. This happens because the
effects sends in the original track are not saved with the loop.
Logic Pro does not automatically assign effects to busses, because doing so would
potentially interfere with bus configurations that you’ve already set up in your song.
Effects that are inserted directly on the Audio Instrument channel will, however, be
automatically recalled when the loop is dragged to the Arrange window from the Loop
Browser.