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THE EXPRESSION CONTROLS EFFECTS
The Expression Controls category of effects contains what is perhaps the oddest group of effects. Other than the effects in the Audio category, most effects make some kind of visual change. The Expression Controls effects are used to control expressions, which are used to control the values of layer properties. In effect, they control the controllers.
One of the big limitations of expressions is that they cannot be animated. Let's say you wanted to simulate an earthquake by applying a Wiggle expression to the Point of Interest value on your camera layer. Once you applied the expression, the wiggling would last for the entire duration of the layer (or, the composition, whichever ended first). Enter the Expression ...
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