It could have to do with the settings on each input device (xbox & DVR) -check their audio settings. I have a better solution for your problem though:
Since HDMI supports 7.1 ch of digital sound, I'd recommend using the optical inputs on your HTR-6130 that are made for 5.1 ch sound. I agree that you should be getting sound via HDMI, I was able to from my xbox to my 6130, but it gets cut down to 2 channel sound (good, but pales compared to true 5.1 ch sound). It believe it has to do with Dolby not being backward compatible going from 7.1 to 5.1. Anyhow, in order to get an optical-out on your xbox, you'll need connect with the a/v cables that came with the xbox, along with the HDMI cable. Depending on how old your xbox is, and which model (like an elite edition, etc), You may need to buy a special converter that will allow enough room for both an HDMI connection and the A/V connection. Trust me, I have an HTR-6130 with an xbox and a cable-provider issued box running through it. Optical is the way to go for this particular receiver since it only supports 5.1 ch sound. You can still use the HDMI ports on the receiver as a switch between your two devices, or you could choose to bypass it if you TV has more than one HDMI input port.
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