This is an educated guess, as I don't know what kind of cables you're using or if any line conditioners in the set-up. On DVD's (I'm presuming that is your HT source?)there is no recorded audio in the "menu" set up between those "sound effects" they use (and that is usually 2 channel NOT 5.1) What it sounds like you have is noise from your processor when no audio signal is present. This could be your processor chip or some other "garbage" present in your digital signal, probably from the transport end. Since it is not present when in bypass or when a digital signal is detected, the root of the problem would suggest either the processor but more likely (a guess) the transport (are you using the Chiro's D/A or do you use external D/A when NOT using it for 5.1?). Obviously some troubleshooting needs to occur but that's where I'd start (esp. if you have good cables, for RF rejection and line conditioners).
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