I just found out that this new X1 DVR box also does not have the issue that older DVR boxes have where when you have it hooked up to a Audio Receiver and the sound would drop out for a second or two when going from a "commercial to tv show" or when you fast forward and rewind.
I always hated that and this is a very nice surprise that this issue is finally fixed!
I noticed my Denon Receiver always now says "Dolby Digital" on the display even when a commercial comes on or I Fast forward and rewind. Which I guess is why the sound does not drop out anymore. With my last DVR Box when a commercial would come on or I fast forward and rewind my Denon Receiver would switch from saying Dolby Digital to something else.
Anyway so glad this is fixed and is a nice bouns to having the X1!