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I thought it was explained to you that many things can be done to dynamics and frequency balance below 22 kHz.

There's no basis for you to assume that the sole change between a CD and the remastered SACD or DVD-A is in the ultrasonic region. Plenty of changes can (and are) made below 22 kHz.

I believe his point was that since the dream images are purely internally generated, the phantom external stimuli is superfluous, not that the phantom audio or visual images aren't interesting.