Hey Cool - I'm in Austin, TX as well...
Well, one of the sources I tried was a XBOX 360 which has RCA audio cables as inputs to the RX. That didn't work. My cable box is HDMI into my RX so I assume that won't work. :-(
I'm thinking of just grabbing one of those speaker splitter selectors with independent audio controls and just running my outdoor speakers through that. When I want to listen outdoors, I just click a button and I'm enjoying music outdoors. Bad part is, since I'm running 5.1 I'd have to either switch from THX to pure stereo to get a decent sound (assuming, haven't tested yet) to my outdoor speakers. If I just connect my outdoor speakers to my 'fronts', for example, I'm not sure how that would sound since I'd be missing a bunch of stuff out of the center.
I guess another options is to go pre-amp out into a seperate amp and hook the outdoor speakers up to that. Seems like I may be in the same boat as above as I only see FRONT and CENTER pre-outs and that might end up giving me a pretty crappy sound outdoors.
Anyone else do anything like this with this deck? Suggestions?