I appreciate the feedback on the disconnect feature. I'm more interested in the pre amp assignments in "custom" mode. I have a power amp for my 7 primary channels, I'm wondering if it will let me use 4 height channels amplified by the Denon, and run 7.1 on my external amp and sub.If you look at the schematics, it would appear that the disconnection is done the same way, that disconnects the power signal input to the pre out regardless of custom or preamp mode.