.swf sound file won't loop

I'm pretty new at using Flash (2004) in conjunction with Dreamweaver (MX) and I thought I'd gone through this tutorial really carefully, but I can't seem to get my .swf sound file to loop. I checked the 'Loop' box, even changed the Parameters manually to "Loop=TRUE" but the *mother* won't loop, it just plays through once and then stops.

Anyone have any ideas?