This one is very handy for automating repetitive tasks. In this tutorial I propose two plausible uses for the layer index property when working with expressions- one for using Time Remap as a means of maintaining a cleaner comp structure when iterating instances of a still image and one for using indexes in combination with valueAtTime to create a quick cascade effect on any property.
It's gonna be rad. Really rad.
I'm aware of the robo-voice glitch. Still working out some of the kinks in my hackintosh, it appears.