If it's brute force, that's a ton of work, but it's not really a complex technical challenge.I can't believe it works like that, as localization would very quickly become both a nightmare and an almost certain disaster. It already doesn't work properly in games that couldn't be conceived without such technology (i.e. sports game), so I can't imagine it being good enough in TLOU. I'd guess they went the bruteforce way with multiple recordings, hence the 2 discs of the retail version.