you should check out bestdani's sound spheres
http://steamcommunity.com/sharedfiles/filedetails/?id=728366804I used them for the sound in my Valleyfair project. I don't think there are any ways to have triggers or anything but they play sounds and music where you want and you can adjust it.
I guess he updated it now you can have triggers! YAY! THANKS BESTDANI!!!
p.s. look through his other stuff. there are a lot of useful things.