It sounds like this is the 1956 SuperScope widescreen reissue, not the actual 1940 roadshow version. (Meaning the extra Deems Taylor stuff isn't in it.)
Doesn't this also mean the mag track is the phone line recording of the Fantasound track, and not the true original 1940 Fantasound? IMDB says the phone line transfer was done by RCA for that '56 re-release...
This is still an absolutely awesome find, make no mistake.