If that doesn't work, or you want to use it on a different effect, just place the effect on the timeline and produce it normally. Import the produced video and place it in the timeline then use the Power Tools|Video in Reverse button. You may want to use the Chroma Key to make the black background transparent so the main clip will be visible behind the backwards effect.
EKSVid's approach is the easiest way, though
YouTube/optodata
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