Apple Logic Pro 9 - Manual (Page 1040)

Assuming accurate beat mapping, everything will be in time with the metronome tempo,
affording you a number of advantages for further project development:
• The metronome click can be used when recording additional regions.
• Quantize functions can be applied to newly recorded regions.
• Loops (both MIDI and Apple Loops) will automatically adjust to the tempo when used
in the arrangement.
• MIDI regions recorded without a click will be displayed in a musically meaningful way
in the Score Editor.
• Additional MIDI regions can also be created via the Step Input function, without
sounding too stiff. This looser feel is due to the parts being played back with all of the
tempo changes created by the beat mapping process.
By default, the global Marker, Signature, and Tempo tracks are visible when you enable
the display of global tracks. If the Beat Mapping track is not displayed, choose View >
Configure Global Tracks, and select the Beat Mapping checkbox. For detailed instructions,
see
Hiding or Showing Global Tracks .
Beat Mapping MIDI Regions
The following section takes a look at the beat mapping procedure in the Arrange window.
Beat mapping is also possible in the Piano Roll Editor, Score Editor, and Hyper Editor,
where you have the added advantage of directly seeing the corresponding notes. To use
(or test) beat mapping, you’ll need at least one MIDI region that doesn’t fit the current
tempo. You can simply record one without a metronome click, if none are available.
In the upper part of the Beat Mapping track, you can see a ruler which contains a graphical
representation of musical bars, beats, and subdivisions. These reflect the division value
set in the Transport bar (and are also dependent on the current zoom level).
To allocate note events to particular bar positions
1 Select the regions that you want to use for beat mapping.
1040 Chapter 34 Beat Mapping Regions