Gonk, what has me confused is that I never select Pro Logic II. I always set Dolby Digital. In the course of navigating different content on the cable box, the 990 switches to Pro Logic II on its own.
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Outlaw 990/7500
Cambridge Azur 840C
Oppo DV-981HD
Fronts: Ohm SFRS-11.200S3
Surrounds: Ohm Micro-Walsh short omni
Subs: Hsu ULS-15
Motorola/Comcast DCT6412 III
Panasonic PT-50DL54