Creative Effects > Warper > Setup Options >
Slip Settings

Slips a clip by a specified number of frames. Click in the field for the clip you want to slip and enter the number of frames. The first frame of the clip will be repeated by the number specified to result in a delayed start.

Select: | To slip:
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Front | The front clip.
Back | The back clip.
Matte | The front matte.
BMatte | The back matte.