Hello,
I've found that when using acceleration or a ramp for a period of time it's not equivalent to deceleration for the same period of time for many effects.
For instance, the pinwheel effect for 5 seconds, using a ramp on speed from 10 to 30. Then directly after this, add another pinwheel effect for 5 seconds but speed goes from 30 to 10. When played, the spinner accelerates to a peak speed then slows down, but it gets to zero speed, then reverses for a short period of time, indicating that it was decelerating more than it was accelerating in the first effect. I've noticed this happens if you use ramps or other options in the value curves, as well as using acceleration or deceleration within effect options. How do you get symmetric acceleration and decelerations?