Regarding digital audio on the HD-PVR - when I first set up the HD-PVRs the Hauppauge drivers did not support digital audio. Now they do but some of the folks using Sage think that using digital audio causes stability problems with the HD-PVR. I will try switching one of mine to digital to see how it goes. But this isn't a huge issue for me as the HD-PVRs are used primarily to record sports and movies. The digital audio doesn't matter that much in sports.