Apple Logic Pro 9 - Manual (Page 1038)

Using the Tempo Fader
You can create a real-time tempo fader in the Environment window by choosing New >
Fader > Specials > Tempo Control. This fader can control the project tempo (using Meta
event #100). There is no need to connect this fader to anything, unless you want to record
its output.
A tempo fader has a range of possible values from 50 to 177 bpm. External MIDI data can
be used to control it, with an input value of 0 resulting in a tempo of 50, and an input
value of 127, resulting in a tempo of 177.
If you place a tempo fader between the Physical Input and Sequencer Input objects in
the Environment, you will be able to:
• Record tempo changes
• Control the tempo with any desired MIDI event types
This way, new Tempo track data can be recorded intelligently. The original tempo data
is only erased in areas that actually contain tempo changes.
If a tempo fader is moved during playback or recording, all data defined in the Tempo
List is turned off, until Logic Pro is stopped.
Movements of a tempo fader are ignored when external SMPTE sync is active. A tempo
fader can therefore be used to deactivate the sync reference during playback or recording,
if you wish.
Note: The tempo fader’s Parameter box displays pitch bend events as the Input definition
(by default). This allows control of the project tempo with your keyboard’s pitch bend
wheel.
1038 Chapter 33 Advanced Tempo Operations