The discrete on/off codes from RemoteCentral must have been from the 950....I would guess.

On the 990, what did the discrete ON code bring you to? Did the 990 turn on to the last input it was on when it was shut down??

(I am also in favor of discrete sound mode selection rather than having to toggle through the different modes to get there....but doubt whether this could be done with a firmware update, however)