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Deriving one position keyframe's value from another

Posted: November 20th, 2014, 1:13 pm
by israelu
Hello AE expression community.
Boy, I hope someone can help me with this, because I can't find the answer to this anywhere. At any rate, here's what I'm trying to do - I have a layer with various position keyframes throughout. One of those keyframes, however, needs to derive its value from the preceding keyframe. In other words, I need to be able to edit the position value of, lets call it keyframe 3, and have that automatically become the value of keyframe 4.
Does ANYONE out there know of a way? Please, please, please - I'm up against a serious wall.
I really appreciate all help. Thanks guys