Those links with instructions were helpful, thanks.
I made a rainforest area and managed to get the ambient swamp sound to start on teleport in (I assume- it starts when I play the character from the starting area).
The music is proving difficult. I want NO music on tele in and then when the player finds a ruined cathedral near the center of the map, I want music to start.
It appears that music plays when you log into the game no matter what. I guess it's default module music but I can't find a way to turn it off. There is no trigger, it just starts playing as soon as I do. It seems to override any music I put down. Really annoying.