I don't have first hand experience. But if you run serial to each and no Comm cable to the 800. You may get around the annoying issue that the 800 has to be on (which will load and play what ever is in it) when you turn the system on for other sources (TV, Radio, DVR etc.).

I don't know if this would work or it's important to you. I suspect it would work and always drove me nuts with 861 and 598 setup.

- Fiddler (IMHO)

If you think listening to music is fun, try learning an instrument.
HT: G61RSL, 4x5K, 5.5KHC, 2xSC6000, Transporter, HD621, Philips BDP7501 4K, Tivo, 65" LG OLED 4K C6
Computer: Foobar2000, 5K, Mojo, HiFiMan HE1000 V2