^^ That's quite a position to take - that manuals don't answer the OP's question about whether a receiver processes the MCH analog inputs. My Denon manual explains that no processing is applied to the external inputs. (That was the question, btw, not whether there's a conversion to digital along the way.) As to whether there's a digitizing step, are you suggesting that a manufacturer would go to the expense of doing ADCs for up to eight channels, but not apply bass management, distance adjustments, tone controls, or any other digital processing to the resulting PCM? Why would they do that?
The posts in your link are almost all about the analog stereo and phono inputs, not multichannel analog - the subject of this thread. The limited discussions of MCH in those posts come the same conclusions that have been posted here - that there's no digital processing except for a few processors that actually do an ADC. I've read manuals for HK and Denon receivers that digitize the external inputs and they explain at some length how to take advantage of the ADC. Manuals for many other receivers explain that no such processing is done with the MCH inputs, although the meaning of those explanations is sometimes not very clear.
At any rate, I think it's likely the manual for the OP's receiver will provide the answer to his question.
Edited by BIslander - 6/11/13 at 9:44pm