Manually draw an animation curve
The Sketch Keyframes tool (next to the Edit Keyframes tool) lets you sketch animation curves in the Keyframe Editor graph area, creating keyframes as you go. To sketch a curve, the parameter to animate must first appear in the parameter list. See Create a custom curve view for methods of displaying curves.
Sketch an animation curve
In the parameter list in the Keyframe Editor, select the parameter to sketch.
Select the Sketch Keyframes tool (the pencil icon above the parameter list).
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Drag in the graph area to sketch an animation curve.
Drawing new keyframes overwrites existing keyframes at the frames where you draw.
Add an individual keyframe using the Sketch Keyframes tool
In the parameter list of the Keyframe Editor, select the parameter to modify.
Select the Sketch Keyframes tool (the pencil icon above the parameter list).
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Click in the graph area to add a keyframe.
Additional clicks create additional individual keyframes.