If the sound is done....

[Kurt Kaufman]

Mike, you have to handle the playStopped message with the player you are 
using to play the audio files (audioPlayer in the example below).  
Pseudo-code:

on playstopped
if there is a next file on the playlist then
set the filename of player audioPlayer to it
end if
start player audioPlayer
end playstopped

HTH, KK