I've got an AVR and a separate integrated amp that does HT passthur (volume then controlled by AVR). Currently my SqueezeBox is hooked up directly through the integrated amp and my video-based stuff goes through the AVR then out the integrated amp for the front channels. The catch is I have to switch between the "source 1" and "passthru" input selectors.
This was easy enough to control with my harmony remote but I'm not sure how to handle this on my JRiver box. The SB will get replaced with a DAC and it's straightforward enough to set up two zones along with ZoneSwitch rules to get the signal going down the right path but, to complete the puzzle, I need to be able to send an IR code to the integrated amp to switch the input selector. I poked around the forums and, of course, the UI but didn't see anyway to configure such an action.