(i do not know how the altimeters work)
lever to the left: is for the resistor (resistor is none to max setting)that manages the amount of changes can be done at once ;
lever to the right of the lectern: is to start the filling the balloon to keep it a steady level;
lever to the far right: is to reverse direction of what the second lever to the left of it does (it will make it so it takes in less):
i think i did a splendid job