Is there a way to play a single audio file (such as ambient wind) continiously for as long as you remain in a region? (like the Ashlands or Bitter Coast)

Can this be done by simply putting the file in the regional sounds list, setting it's frequency to 100 and removing all others?
To clarify a bit: When you would enter the Ashlands region, you would hear the wind blowing, then, when you enter the Bitter Coast you would hear a coastal sound playing instead.

Well, this is what I'd try.