Apple Logic Pro 9 - Manual (Page 1028)

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Double-click either range value and type a numerical value into the text field.
These user-defined values are displayed in yellow. If you want to return to the automatic
scaling mode, use the procedure described above, and leave the text fields empty.
Switching Between Tempo Alternatives in the Tempo Track
The Alternative pop-up menu in the Tempo track allows you to switch between different
tempo maps. Put another way, you can create up to nine different tempo track versions
per project, and switch between them.
The original tempo track is automatically assigned to Alternative 1.
To create an alternate tempo map
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Choose an unused number (2 through 9), and create the tempo events.
This will be a blank tempo map, that contains one tempo event at the beginning of the
project.
To copy all tempo events from one tempo alternative to another
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Hold Option, and choose the target tempo alternative from the pop-up menu.
This creates a replica tempo map, which can be adjusted slightly, allowing you to
experiment with small tempo variations, while retaining a fallback map.
Relationship Between Tempo and Beat Mapping Tracks
Actions performed in the Beat Mapping track result in changes to the Tempo track. These
include alterations to existing tempo change events, or the creation of new, tempo change
events.
1028 Chapter 33 Advanced Tempo Operations