There are like what, maybe of handful of weapons?
Katana
Great Katana
Dagger
Sword
Great Sword
Polearm
Club
Stave
Axe
Great Axe
Hand to Hand
Then, of course, Ranged Weapons, which disperse into:
Rifles
Crossbows
Bows
Throwing
Although there are different SUB weapons (Scimitars, Degens, Blades under the Sword category; Lances, Spears, Couses under Polearms; Uchigatanas, Katanas, and Straight Katanas under Great Katanas), they all make the same noise when hit. Every main category has its own effect that applies for all the sub categories mentioned above, with about 3 or 4 animation swings for each hit.
So, roughly, all weapons combined, you have only 15 sound effects. Of course, I obviously left out Instruments, but to my knowledge, there are only stringed, wind, and voice instruments, an extra 3.
Then you have Summoning Magic, Black Magic, White Magic, and Ninjutsu. Every spell would have its own sound effect, so thats where things might get hairy. They all start out the same in their main categories, i.e. All Black Magic spells will start off sounding the same, but Blizzaga IV will sound completely different than Warp II at the end.
Of course there will be dozens and dozens of sound effects for using items and entering houses and various monsters, but if its just the main weapon categories, I doubt its anywhere surpassing the 6GB install.
Nice to see other FFXI players here. I think Im the only serious full time player here @__@