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That's right. More specifically, it will add the number of frames required by the pose to the animation if they do not already exist. Say you have a 20 frame animation and a pose file with "clearFigureKeys 20", if you apply that pose in frame 10 of the animation, the animation will expand to 29 frames to accommodate all the frames in the pose. Poser will prompt you for confirmation before adding the frames.

I think the "clear" got me confused... sounds more like removing than adding.

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