How would I go about changing a token bar value?   For example, I created a custom attribute called Rage-Rounds. Can I somehow lower or increase with a macro, something like @{Rage-Rounds}-1?  If possible, I could make a value that is equal to my rage bonuses that I can turn on and off (for example, an attribute called Rage-Bonus, which, with the press of a button, increases from 0 to 2, and add +@{Rage-Bonus} to my melee attack macro, then click another macro to lower Rage-Bonus to 0 to make the rage bonus stop.)