Azimuthal-harmonic synthesis generates a universe of matrices (UMX) with maximal input-output asimuthal correlations for two (BMX), three (TMX), four (QMX), etc., intermediary channels. The basic, mono-stereo-compatible BMX accepts augmentation channels converting to TMX, QMX, etc. In quadrasonics, the psychoacoustically discrete TMX essentially equals the fully discrete QMX. The feasibility of multichannel disc, broadcast, and tape is profoundly enhanced by the sufficiency of using 2-kHz-wide augmentation channels.
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