In this tutorial, we’ll learn how to do some experimental animation on a footage based on music. For this effect we’ll dive into learning time remapping, waveform and a bit about expressions as well.

Most people don't know about the loopOut and loopIn expression methods...

This script will execute the "Time-Reverse Keyframes" Keyframe Assistant found under the Animation menu.

Once you run the animation assistant for Exponential Scale, the keyframes are locked down and if you need to change the start or end values, you have to delete all the intermediate keframes and re-run the animation assistant. Here is a way to replicate the Exponential Scale via expression.