To install, simply extract the sound folder into your WoW root folder.
In patch 6.2, Blizzard decided to change the female orc combat voice for some reason. What they seem to have done is redirect a lot of them to the new, much more loud and aggressive Iron Horde orc NPC sounds. These sound really jarring when juxtaposed against the remaining unaltered sounds, and I haven't come across a single female orc player who likes this change.
I took a sort of scattershot solution to this by replacing the attack, wound and death sounds for the 3 Iron Horde sound sets. Note that this will also change the sounds for those NPCs, and there's not much I can do about that.
There still seems to be 1 or 2 sounds that are not covered by this fix. I've only heard 1 that still sticks out after some testing on training dummies. If anyone could help me locate the source of these I would be grateful.
