Actually it was gonk's answer to my electrostatic headphone question that led me to this idea.....Maybe someone else will find it useful.
I'll use zone 2 for headphone (notably analog audio only and that's OK) to feed small amp that powers STAX phones. I have a dishnetwork receiver in basement with optical out. I'll feed an optical out and S-video from it into VIDEO-2 of 990. Will use secondary video monitor(have an old SONY pro monitor) and phones. That way grandson and I can each have our own. (works for Mrs nfaguys also-she's happy...you know home shopping etc.) second dish rcvr in basement works from living room because of RF dish remote, Happy camper here
Now a question about remotes: Do the remotes discussed here MX-700 and above have RF capability? If so how about secondary receivers that would interface with other equipment...and also with 990?