![]() Some early 1980s models in the PT series of keyboards, such as the PT-30, PT-50, PT-80 and PT-82, were not marketed under the Casiotone name. ![]() After the 1990s, most Casio keyboards utilized PCM tone generator or its variants. The later, more professional range of keyboards, the CZ series (1984–1986), used phase distortion synthesis, which is mathematically almost identical to Yamaha's frequency modulation synthesis, although implemented slightly differently in order to avoid patent infringement.Īfter the release of the Casio SK-1 in 1985, gradually PCM sample-based tone generators became dominant in Casio's keyboards line. The larger weight bit provides the fundamental, and the smaller weight bit provides the harmonic complexity. Some other keyboards (such as the MT-35 and MT-45) use a combination of two different binary weighted numbers (1 and 64).The later model of this family, the MT-65, is one of the more well known and sought after models, as it also contains auto-accompaniment drum beats and bass lines. ![]() The famous VL-Tone VL-1 (1981) uses a method of sound synthesis based on the Walsh function.The original Casiotone keyboards came in three distinct families, separated by the method of synthesis. Sampletone SK-1 (1985, sampler) Families
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