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Echo


    This effect combines frames from many different times in a layer. It has a variety of uses, from a simple visual echo to streaking and smearing effects. This effect must be applied and is visible only in the Composition window, not the Layer window, and it is visible only when there is motion in the layer. By default, a layer's mask and any previously applied effects are ignored when you apply the Echo effect. If you do not want them ignored, precompose the layer with other effects before applying the Echo effect. This creates a new composition with the mask already applied. Whenever Echo needs to retrieve a frame, it can do so from that composition.

    The Echo effect is based on the positions of the previous or subsequent frames.
    The Echo effect is based on the positions of the previous or subsequent frames.

    For more information, see the After Effects product section on Adobe's Web site.