Are the usual "Dolby" formats analog only? I have selected the digital output from my DVD player (Tosh 900E) to "Bitsream" and connected a coax cable btw player and my Denon 3801 and, still, the 3801 always selects "Analogue" when in "AUTO" input mode. Manual selection of the digital input mode to either DTS or PCM puts out no sound at all. What are the available digital formats and how should I select them? Txs.