This article is from the RCA SelectaVision VideoDisc FAQ, by firstname.lastname@example.org (Tom Howe) with numerous contributions by others.
A small number of CED's were issued with dual soundtracks, allowing
owners of stereo CED players to select the desired soundtrack with the
Audio A-B button or switch. Several of the exercise and instructional
CED's allowed the user to listen to just music, or music with
instructions. "Space Shuttle: Mission Reports" had separate soundtracks
for the astronauts' narration and NASA Ground Control. There also were a
few bilingual titles which could be listened to in English or Spanish.
Bilingual titles include: "The Adventures of Robin Hood" (CBS version),
"A Boy Named Charlie Brown," "North to Alaska," "Return to Boggy Creek,"
"Snoopy Come Home," and "Those Magnificent Men in Their Flying Machines."