First of all, my neighbors PVR performs exactly like mine. When choosing Stereo in the PVR's audio menu, the TV sound is fairly loud. When I choose Dolby Digital, I lose at least half volume. I had the TSN hockey game tonight at 90 on my tv on a scale of 0-100. I choose Dolby digital so I can have proper surround when i watch movies on showcase, bravo , etc. When watching TV programs with mute activated on TV and my receiver's optical, sound volume is fine. As soon as i start the Galaxie music service, i loose at least 10 - 15db of volume and lose some bass. Most stations on galaxie sound thin and horrible. As for the bell STB volume, If you choose stereo, then incrementing from 0 - 25 has effect on TV volume. Choose Dolby Digital and its 0 = OFF and 1-25 = ON. On a side note, volume between TV stations are all over the place. Example, Score HD is loud and TSN HD is soft. Very disappointed.