So you are always outputting PCM, it sounds like. Interesting - I'd have thought it would have used Dolby Digital at least some of the time, and was wondering if it was failing to flip between modes. Below is a quote that I found here :

Quote:
Audio
If you chose to use the optical jack on the back of the TiVo, then you probably have a Dolby Digital decoder in your receiver. However, if your audio system supports optical, but doesn't support Dolby Digital, then you may want to have the TiVo convert Dolby Digital to PCM. Under Audio you can also turn up, down or off the Sounds Effects. Personally, I like them off.
What if you try making two changes on your Tivo to see what effect they have on the 990? First, try turning the menu sound effects off (Audio Settings | Sound Effects Volume). Second (and this may be a worthwhile change in general, particularly for HD content that is will come through in Dolby 5.1 on at least some programs), try changing the audio format from PCM to bitstream. It's not clear to me how, but I think it's under "Audio Settings" and "Dolby Digital."
_________________________
gonk
HT Basics | HDMI FAQ | Pics | Remote Files | Art Show
Reviews: Index | 990 | speakers | BDP-93