Background
SD Synthesis followed on the heels of the more advanced Phase-Distortion (PD) Synthesis employed in the successful line of Casio CZ synthesizers. When Casio decided to retire the CZ line, they decided to go in two directions: more complex (the VZ "Interactive" Phase Distortion line), and more traditional (SD synthesis, starting with the HZ-600). In turning to SD synthesis Casio meant to create a synthesis engine that was more comprehensible and accessible than Phase Distortion synthesis. Yamaha's then-active lawsuit against Casio's PD synthesis method (which claimed PD synthesis infringed on Yamaha's patented Frequency-Modulation synthesis), may also have contributed to Casio's development of SD synthesis to diversify their offering, even while they expanded upon PD synthesis in the VZ line of synths.
The 1987 Casio HZ-600 was the initial model and was considered an entry-level offshoot of the "Z" series of synthesizers that included the CZ and VZ lines. The subsequent SD syntheizers were marketed as advanced home keyboards (i.e., including speakers and programmable accompaniment) launched under the HT prefix (with the notable exception of the non-editable, preset-only Casiotone version, the MT-600).
Read more about this topic: Casio SD Synthesizers
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