hijack!
would running two cp4's and an omni/card into an mx100 be considered MS as well? There's a center panned to both channels and an independept L and R as well. Would the sum/difference occur in the same way? of course, this would all be done on the fly.
I've never seen this discussed before...sorry if it's a dumb question.
They seem to be very specific about these things. Classic M+S is a Blumlein figure of eight at 90^ to source and a cardioid center toward it with space between (coincident).
Schoeps has a Stereo mic that has a supercard front pick-up. (CMIT5U)
In concert recording, I wonder how much valid Side information occurs at 30 to 150 feet from source, but I have no experiences to back that up. (I'm dying to hear the results of the CMIT5U from DMB at Roosevelt Island.) [EDIT] Shotgun, but not a stereo mic, my bad.
That does not mean that other techniques aren't good, better or invalid.
The big difference that I see is that the L-R needs to be out of phase.
(Teddy or Nick, check me on this one - Fig-8 has a front lobe/back lobe phase inversion, doesn't it ?)
A classic three mic technique would be a Decca Tree, good for big band and orchestra due to the wide source.
There have been many engineers who have tweaked the Decca tree.
It sounds like you are on to something. Make it your own and run with it.