Adding keyframes to a Value graphThe pen tools provide the most flexible way to change temporal properties in the Value graph or a motion path. Editing with the pen tool is similar to modifying a path in a drawing application such as Adobe Illustrator. For more information on using the pen tools, see Drawing a Bezier mask with the pen tool. For best results with the pen tool, you should understand how Bezier interpolation affects the Value graph and the motion path. When you use Bezier interpolation on a graph or path, you can control the shapes of corners, making them into smooth curves or angled corners. See Bezier temporal interpolation. To add a keyframe to a Value graph using the pen tool:
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