Need a little help with this. I don't deal with LG. Customer just purchased this and I have a DM system in place already. It's coming off an output of a 6X4 switcher. Is there a module to control this? I looked at the specs and they are showing a USB to serial adapter and a Mini to serial adapter. Anyone know which one it is. There aren't any speakers in the room I will be using the TV speakers for sound. TIA