But, as I said it would be commercially senseless to create a discrete FM system just to transmit decoded or demoduated non-discrete source material.^^^(Discrete) Quad albums/music sources - (2nd paragraph RCA2.pdf)Original RCA CD-4/Quadradisc Announcement From: consumer's guide to FOUR-CHANNEL SOUND a HIGH FIDELITY publication (I bought the magazine in 1972-06) Kirk Baynewww.quadraphonicquad.com
IIRC, the WEA group expected that ~50% of their albums would be
(discrete) Quad soon after selecting CD-4.
Of course, both SQ and QS encoded Quad albums could be decoded
and broadcast with the (Dorren) discrete Quad FM system.