How do you make the bottom screen fade out too?

You can use the DISPLAY command to change which screen you're using. When you use DISPLAY 0, all commands will affect the upper screen, and when you use DISPLAY 1, all commands will affect the lower screen.

Great thanks! Now what about fade in?

Just set all the values to 0. That would be no transparency, no red, blue, or green. Same command, different settings.

Awesome thanks!