Help ! Due to my last machine expiring I bought the above model as a stopgap. All seems well except I am not getting any output to my subwoofer. I'm using the digital optical output to my home cinema system, and I've verified the other channels are working OK with a setup disk so. And it was working ok with the old DVD player before it expired. There are a stack of paramaters in the system setuo but the manual is pretty unhelpful. Anyone have this machine who could explain the audio settings I need please ?