I know what this is about as I have the same problem myself. The op wants to take a published .swf file and convert it to an .avi format for viewing on an iPod, but the conversion results in no sound. I can't see any publish settings in Flash other than "Protect from import" that might have an effect, but either way the published .swf can't be converted with the sound intact. Might be a copy protection thing, but I'd be interested if anyone has a workaround for this.