Azimuthal-harmonic synthesis generates a universe of matrices (UMX) with maximal input-output azimuthal 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 multi-channel disc, broadcast, and tape is profoundly enhanced by the sufficiency of using 2-kHz-wide augmentation channels.
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