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Dynamic expressions allow for the temporal unfolding of arbitrary sequences of action units.

Located in the Dynamic Expression tab, the interface is very similar to the Action Units tab:

Each row corresponds to an action unit. Time runs on the horizontal axis, while activation level ranges on the vertical axis.

Curves can be drawn using control points. Control points are created and deleted with a middle mouse button click.
They can be moved around by left clicking and dragging them.

The active time region of a dynamic expression corresponds to the unobscured portion of time shown in the interface.
The position and duration of this region can be modify by clicking and dragging on one of its borders in the timeline.