Apologies in advance, as I think this has already been covered earlier in this now very long thread ... I could not find a clear answer ...

I have a Lumagen Radiance XE, with three HDMI sources: (1) an HD250 Tivo unit, that outputs audio only on a toslink not HDMI, (2) a Merdian 800 that outputs audio on the MHR three SPDIF cable output, and, (3) a Denon 3800 Bluray player.

Processor is an 861v4. Projector is a Marantz S4

I use the 800 and Denon for both Movies and for music playback.

Where in the chain should I put the Radiance and the HD621? Which box does video switching? Where would audio switching be? What problems will I likely encounter?

DirecTV HR21, Ram modded Oppo 93, JRiver MC17 on Win7 wi/SSD, Empirical Audio Ultraclock Offramp, 861v6, Bryston 28B SST2 amps, Salk 12" Soundscapes with Dueland caps, RAM modded Audyssey Balanced Pro, Lumagen Radiance, MarantzS4