Now I'm completely baffled.
I just completed the firware update - installation successful and new version confirmed.

When I set all speakers on the 990 to LARGE and SUB to LFE, I can control all levels independently including the SUB by pressing the TEST button on the remote.
Is this all happening on the analog domain? or is the 990 doing an A-D-A conversion to the analog SACD signal?
I thought setting all speakers to LARGE kept 7.1 in the analog domain.

Also, is there a definitive list of changes that the update implements? if not, why?
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990/Oppo BDP-83SE/Toshiba A3/Emotiva XPA-3/B&K ST-1430-II/Gallo Ref 3.1/Gallo Reference AV-Center/Gallo A'DIVAti(3)Rear/ MIT Term 2&4 Cable/Mitsubishi WD65C9//Monster HTS-1000.