Apple Logic Pro 9 - Manual (Page 1035)

Scaling Tempo Changes in the Tempo Operations Window
The Scale Existing Tempo operation alters existing tempo changes proportionally (scales
them). This allows you to speed up an entire project section, without losing the
relationships between any subsequent tempo changes within the area. Scaling is done
by percentage. Positive percentage values speed up sections, and negative ones slow
them down.
Stretching Tempo Curves in the Tempo Operations Window
The Stretch Existing Tempo Curve operation stretches or compresses an existing tempo
curve. The Position or Time parameter is used to define the start point of the area that
you want to change. You can then enter either the new end point of the tempo curve as
a bar position or SMPTE value, or set a Stretch value for the curve (as a percentage).
Reducing Tempo Changes in the Tempo Operations Window
The Position or Time field defines the start and end points of the area to be processed.
Density determines the number of tempo events that remain per bar after processing.
You can select values between one tempo change event per bar (1/1) and 32 per bar
(1/32).
Randomizing Tempo in the Tempo Operations Window
Use the Position or Time parameter to define the start and end points of the area to be
processed. Use Randomize to determine the amount of deviation from the current tempo,
in beats per minute (bpm).
Density defines how often the new tempo events occur. You can select values between
one per bar (1/1), and 32 times per bar (1/32).
Using the Tempo Interpreter Window
You can use the computer keyboard or incoming MIDI events to set the project tempo.
Put another way, Logic Pro will chase a manual synchronization signal (also known as
human sync). This method of synchronization is fairly loose, in that if the manual sync
impulses stop coming in, Logic Pro continues at the last tempo it received.
You use the Tap Tempo command to generate tempo timing events, by literally tapping
a computer or MIDI keyboard key.
To enter manual synchronization mode
Do one of the following:
µ
Choose Manual in the Sync Mode pop-up menu of the File > Project Settings >
Synchronization > General pane.
µ
Select the “Auto enable external sync” checkbox (on by default) in the Project Settings >
Synchronization > General pane.
1035 Chapter 33 Advanced Tempo Operations