Asherons Call: ACDiscussions: Spell Expiry Sounds

I'm sure we've all heard the sounds of buffs and debuffs as they expire.
This week's ACDiscussions question is as follows:

Should spell expiration sounds differ based on the type of spell that is expiring?

It could be as simple as negative spell expirations have one sound and positive spell expirations have a different sound, [could even be the same sound backwards!] or it could be as complicated as different sounds for all the types of spells, life, creature, item positive and life, creature item negative.