And here I am again I've got a Logitech Z-680 surround system (purchased initially for my computer) that for the time being also serves as surround for my TV. Now, I've come to the (shocking) conclusion that Telenet (our cable service provider) does not send out surround with every (pratically none actually) movie and my system does not detect what is coming in through the optical. It plays sounds in pro logic and movie mode, stereo and stereo X2, and seemingly through every speaker... As I've never had surround at home I can't tell what I'm getting when. And no, my cheap ass budget does not allow an upgrade for the time being. I gather most low end A/V receivers would display what they are getting in? I hope there is some way to verify?