add up to 100 pixels anywhere on the map (probably on the white border) to indicate which background sounds will be played when your map is run (if any at all).

set the red value to 50
the green value is the time (in 10ths of seconds) that the game will wait before playing another sound
the blue value indicates which sound number to play (snd_x). you can therefore add your own  sounds if you wish.



for example, if you wished to play one of the bird calls in your map you might set a pixel to:
(r,g,b) (50,40,1)

amb_1 will be played, then 4 seconds later another sound will play
 
