What is the opposite of ::OnMount?

[Wheatley]

I know BL Torque uses an ::OnMount function, but I was wondering if there's something like ::OnDismount or ::OnUnmount.
I'm using it to play a sound at the player's location when they unequip the item, if that changes the matter in any way.

[Ad Bot]

[Greek2me]

onUnMount

[Wheatley]

What method would I use if I wanted it to make the noise when they change weapons, as in, the item I'm working on is no longer selected?
This being if they scrolltools(1), Scrolltools(-1), or close their inventory?