So maybe it is a Dolby 2.0 source and defaulting to Pro Logic. Gotcha.
If that is the case, and I then flip the 990 to "Dolby Digital", I guess the 990 doesn't automatically retain that default? In other words, it won't remember that I want Dolby 2.0 sources processed as "Dolby Digital" rather than Pro Logic?
I'll try checking the input menu's defaults. I just never did before as I thought selecting a decoding option automatically updated the default for that input.