Scrolling down a long list in a display using voice

I have an APL display template that contains a list of variables in a vertical sequence. When the list is longer than the screen, I need it to either, 1) scroll automatically, or after a set period of time, or 2) allow the user to say “scroll down” and the list scrolls.

Can’t seem to figure out how to do this. Anyone have any ideas for a newbie?