I didn't forget about you. Just kind of busy.   Understanding how this animation works is relatively easy. Everything is essentially a ratio, a percent in the range of [0,1]. Even Sine is a ratio, but is in the range of [-1,1]. No matter what number you put into Sine, it will return a number in that range, which is where the up and down motion comes from. The contour of a wave can be created by using a CustomEase, getting a ratio from it, and multiplying it by the height and Sine ratio
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