Perhaps I could interject a question he

Is there such a thing as a hybrid SACD/CD in which the SACD layer is
5.1 channel surround sound? If so, does such a disc also include a
DVD compatible Dolby Digital surround sound version of the SACD track?

DVD-A discs usually include a DD track so that one can play surround
sound on an ordinary DVD player as well as a DVD-A player.

Thanks,

Norm Strong