The best way to tell what format you are getting is to not lock the format, set the TIVO on a channel, switch the 950 to that input, and watch the front display of the 950. For the few seconds after the 950 detects the digital audio signal, it will display the format on the right side of the screen ("DOLBY D" and "2/0.0" for DD 2.0 or "PCM xxK" and "2/0.0" for a stereo PCM signal at "xx" KHz). Whichever you see is the format you would want to lock to.

If you are getting dropouts even with the signal locked, I would strongly suspect the TIVO. Just to cover all the bases, are there any patterns to the dropouts? Does it only happen when changing channels (which would indicate differing formats on the different channels, and not a problem)? Does it happen at regular intervals? Does it happen with any other digital audio sources?

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