So, turns out that the "when up/down arrow pressed" headers also respond to the scroll wheel on your mouse! Experiment, have fun, and backpack! Scroll bar responds to mouse scroll wheel, up/down arrows, and click/drag.
Credit to Oranium for OranText https://scratch.mit.edu/projects/40890792/ Credit to Scrachrulz (AKA myself) for the map() function https://scratch.mit.edu/projects/62626510/ Subcredit on that to Arduino
