I'm trying to achieve this kind of trim lenght via expressions.
I'd usually link the start trim to a slider like this: sl=effect("Slider Control")("Slider");
content("Group 1").content("Trim Paths 1").end-sl
and then animate the slider according to my needs manually, but I was wondering if there is a way to make it work via expressions? I guess it should be something related to the end trim's velocity and make the slider value go from 0 to lets say 1 depending on the max amount of the keyframe velocity?