Using an adjustment layer, as in photoshop or after effects, you can add filters or settings to multiple clips at once in FCPx. This video shows you how to create an adjustment layer in Motion 5, save it as a preset into Final Cut Pro x and then use it to apply filters across a group of clips or a sequence.
If you'd like to download this plugin for final cut x here's the link:
http://bananamanafilms.com/add-filter...
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