It might be worth trying a 'LoopSound' just to see if you hear anything - perchance the sound is playing and finishing too quick. I mention it as you appear to be doing it as a one-off outside the main loop. Check for any other sound commands that are killing it prior to the game even reaching the main loop.
Of course, you may have done this already - thought I'd mention it.
Of course, you may have done this already - thought I'd mention it.