Just grab the formula from a free JavaScript reference and insert the data. You already have your three points: [timeA,valueA][0,0][timeB,valueB]. Should be easy enough if you assume that the t interval is a frame. Values can be derived from key frames, in- and out-points or whatever you fancy. The real trick then is to tweak it and account for some oddities in AE that may affect the curve. You may need to include some extra multiplier to control the bias. Mylenium
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