Apple Final Cut Express 4 - Manual (Page 689)

Chapter 45 Using Video Filters 689
IX
Clip Well
Some filters, such as the Bumpmap filter, contain a clip well that allows you to use
video from any clip in your project as a parameter for the filter.
To use a clip as a parameter in a filter:
m Drag any clip from your project to the clip well in the Filters tab.
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Tip: Final Cut Express generators can be dragged to clip wells the same as other clips.
To clear a clip that’s currently attached:
m Control-click the clip well, then choose Clear from the shortcut menu.
Enabling and Rearranging Filters
You can turn a filter on or off without removing it from a clip. This is useful for
previewing different combinations of filters without having to repeatedly apply and
remove them. You can also rearrange the order in which filters appear, to modify the
way they work together.
To turn individual filters on or off:
m Select or deselect the checkbox next to the filter’s name.
Clip well