While part of what makes the game work is the actual soundtrack, there’s just as much work put into the sound effects and ambient noises that contribute to the game’s ambient atmosphere. If sound isn’t really your thing, though, that’s all right; this is just the first in what is planned as an ongoing series of videos detailing how the game is made behind the scenes. But this video is all about how the game hits your ears.
Source: Square-Enix press release