So to fade something in: You must adjust the opacity, like so:

That slider that you see needs to be dragged up and down to change the opacity. You need to change the opacity in even measurements.
My basic opacity changing increments are 7,21,42,61,85,100. Make sure you click add new frame after each change in opacity. If you do this correctly, it should look like this:
What it should look like (Click to Show)
now, in slow-motion, it should look like this:
Slow-Motion What it should look like (Click to Show)
I hope this helps all you pivoters!
- ZephAxix