Effects > Warper > Setting Up the Clips > 
Activating Clips
 
 
 

The following table shows how to set up the clips to produce various effects.

Front Back Matte Back Matte Back ground Effect
On Off Off Off Off Warps the front clip only. This is the same as loading a front clip only.
On On Off Off Off Morphs between two clips. This is the same as loading a front clip and a back clip.
On Lock Off Off Off Wipes (page turns, rolls); regional warps (if the same clip is loaded as the front clip and the back clip).
On Off On Off Off Warps the front clip and matte clip, composited on black.
On On On Off Off Warps over a background with a matte clip.
On Lock On Off Off Warps the front and matte clips composited on the back clip.
On On On On On Morphs between two clips and their mattes onto the selected background clip.