I find that while I enjoy playing with the sound on in general, that shrill sound that plays every time a notification occurs is starting to give me a headache. You guys know the one I'm talking about? The one that plays whenever a unit needs orders, or you're trespassing in city-state territory, or a city-state has a quest, and so on. It can wind up playing several times in a row, and it's sort of like a dog whistle for humans. Hopefully, somebody got sick of it long before I did and figured a way to replace the .wav file or something.