Finally got back into the rig (lots of rain --- when? -- weekends, of course!). This time we went east to Drumheller and hung out in the Badlands. Hot and dry. :-) Now, back to the electronics.
Apparently there was some kind of small wiring issue, but I also learned that there is a control for the centre speaker on the M4-LCD, in the Equalizer area -- oddly, if it's set to 'off' it's actually ON and vice-versa. Though I think they actually did me a favour, because as far as I can tell, my ears match the settings on the radio: off is off, on is on.
And, thank you jamiller45 - yes, when the TV is on 3 and the distro box is set to DVD to front TV it does indeed play! AND has surround sound. Now, I've got to hook my movie box up to the distribution unit as one of the AUX inputs and see how it goes. Won't get the surround sound unless I can also manage to get input from the movie box to the Magnadyne. THAT could be a challenge.
Sirius just shows the Sirius icon - no ESN - so suspect no tuner. I'm a bit peeved - and I'll take this higher up the food chain -- I have inside the vehicle a 'welcome to Sirius from Ford' blurb that gives me six free months. With no tuner (if there really is none) I get six free months of silence. Thanks a lot.
iPhone connects via Bluetooth for voice - the quality is, however, poor. No joy with an audio connection via BT. Hardwired via jack to the AV IN is no problem. (Ditto for an iPad.)
Other than that LOVE the 3011DS - it's a treat to drive, easy to fit into, and just a wonderful all-round home-away-from-home.