Yeah, It's a rudimentary audio mixer. Try mixing together a Gamorrean opera, I attempted to use on my EotE basic campaign. 2 parts pig sounds and 1 part Italian opera. But, I sourced it off of soundcloud. You have to be careful with it, switching maps say from outdoors to indoors. AND Volume, players generally run with headsets, so 10, might be "11" to their ears, then they turn down their rig, if they use voice. It can break the illusion when tree rustling and birds chirping, doesn't immediately change to water droplets and bats screeching. There is a post for page specific audio tracks and /or playlists for battle and calm.