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.

Figure. Tempo fader in the Environment.

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:

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 Express 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.