You can animate slider widgets like any other parameter in Motion, through the use of
keyframes. Keyframing lets you create powerful and complex effects where a combination
of parameters driven by a single widget are animated simultaneously.
You can also use one widget to control another. Treat the widget as you would another
parameter when manipulating a snapshot for a widget.
Note: You cannot create recursively controlled widgets. That is, you cannot use one
widget to drive a second widget that’s already driving the first.
For more information about using keyframes, see
Keyframing in Motion