How to make a custom button that increases/decreases when pressed and the value shown in numeric field in a color design

This is done by setting the href of the custom button to Amulet:internalRAM.byte(x).inc(y) and set the href of the numeric field to Amulet:internalRAM.byte(x).value(). For decreasing value, change custom button href to Amulet:internalRAM.byte(x).dec(y).