Apple Final Cut Pro 7 - Manual (Page 1037)

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Select the filter, then choose Edit > Cut.
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Control-click a filter, then choose Cut from the shortcut menu.
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Select the filter in the Filters tab, then press Delete.
To remove all of a clip’s video filters
1 Click the video filter category bar in the Filters tab.
2 Choose Edit > Clear (or press Delete).
1037 Chapter 63 Using Video Filters