Well, one verdict is in! In the 5-disk Moody Blues set, apparently 4 are in 5.1 SS and the 5th (In Search of the Lost Chord) is just 2 ch SACD.
I listened to Days of Future Past and Search last evening. I chose Days as I am most familiar with it (going back to vinyl; I have it in 3 media) and Search to hear what a 2-ch SACD is all about. Incidentally, these are in order of release with Days in '67 and Search in '68.
The status lights on the Sony player confirmed that Days is 5.1- and Search is 2-ch. The "Multichannel" light on the player also was on for only the former. (I mistakenly stated in a previous post that the "Multichannel Decoding" light on the Sony receiver is lit for 5.1 selections. That is not true as I am using the multichannel analog inputs and of course in that situation the receiver is not doing any decoding.) Since the renditions and status lights confirm 5.1-ch for Days and 2-ch for Search, then the other 3 disks that are marked as 5.1 should actually be that. Search did not say 5.1 SS on the package, the other 4 did. (It still remains to be seen whether or not the bonus material is in 2- or 5.1-channel.)
Days was good, not great. The dimensioning was interesting with voices often coming from the surrounds, and I did hear some good separation of the instruments. During "Nights" I'm sitting right in the middle of the French horns, and at the end the gong came from the left surround and echoed in the right. But there seemed to be some limiting happening in some crescendos (perhaps in the original recording, I don't recall and need to verify) and some harshness/distortion especially in the voices that probably shouldn't be there. This was not a result of loudness; for this "concert" I was conservative with the volume control. I would have thought that remastering could have removed such artifacts, but perhaps not completely.
Search on the other hand was fantastic even if rendered in only stereo! I listened to both the 2-ch SACD track (through 2 speakers only) and the standard CD track with a prologic concert hall SS applied and it sounded great both ways, but I wasn't actually sitting down listening critically to either, doing other busywork instead. I'll repeat that comparison and listen more critically in a future session. But when "Om" (final track) came on, I almost cried it sounded so good !! I had to stop what I was doing and restart that track. What a takeback to my former care-free, mentally impaired days...!
For the record, Seventh Sojourn ('72 release and not part of this set) sounds great in 5.1 with no hint of the aforementioned distortion or limiting. Perhaps the newer works are easier to remaster.
I can't wait to jump into the other 3. More "reviews" coming...! The overall jury is still out on this set, but it's looking promising! Next will be Threshold of a Dream ('69) followed by Children's Children's Children (also '69), then finally Question of Balance ('70).
PS - I noticed that these SACD disks (made in Germany) were created in 2006, so that's an indication that there is still some activity remastering "classics" and re-releasing them in the SACD format. That has got to be great news for me, a newcomer, as well as the early adopters who are still intrigued with this medium!