This paper reports on advances in the art of mastering and editing quadraphonic records using the SQ matrix code . In addition to the basic code, modulations for optimum side splits and diagonal splits are defined, adn encoder circuits are illustrated for producing these special effects. Further, code variations described in the paper include -acroperiphony,- or the reproduction of elevated sounds, and -extra stereophony,- or a method of -folding- the back channels in the stereophonic presentation to spread their images toward and beyond the confines of the loudspeakers. The described variations are encompassed within the scope of the SQ code and are accurately decoded with all SQ decoders. These encoding refinements have led to the design of a -position encoder- which provides all the prescribed modulation forms and which can readily be integrated into a mixing console. An Appendix offers a comparative study between an SQ quadraphonic matrix Standard and another matrix Standard called Regular Matrix (-RM-), which have been adopted by the Japan Phonograph Record Association.
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