Apple Soundtrack Pro 2 - Manual (Page 355)

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Working with Automation
Using automation, you can create changes over time
to volume, pan, effects, and other controls.
Automation offers a powerful way to add drama and interest to your projects. You can
automate volume and pan changes to tracks, busses, and submixes and automate
changes to effect and effect send parameters in multitrack projects. You can also
automate volume, pan, and effects changes in audio file projects.
Soundtrack Pro gives you three ways to work with automation:
 You can add and adjust envelope points on envelopes in the Timeline and in the
File Editor.
 You can record changes over time to sliders, faders, and other controls in the
Timeline, the Mixer, and the Effects tab.
 You can record movements with faders on a control surface connected to your
computer and mapped to Soundtrack Pro commands and functions.
Working with Envelopes
In the Timeline, each track, bus, and submix has a set of envelopes. The envelopes
appear as horizontal lines stretching across the length of the project directly below the
track, bus, or submix. You adjust an envelope by adding envelope points and moving
the envelope points to new values at different points in the Timeline.
For video editors accustomed to working in Final Cut Pro, envelopes provide the same
type of functionality as keyframes. The difference is that you can edit envelopes at a
finer level of precision than you can using keyframes, allowing extremely powerful
control over automated changes.