The DCW and DCA also had a 'key follow' feature which determined how much higher notes affected a sound, making the DCW have a more dull sound with less harmonics with higher notes, and making the DCA envelope faster for higher notes. The DCA (which determined how loud a given oscillator was at a given moment) was also modulated by another dedicated 8-stage envelope generator. In this capacity, it was described by Casio in the CZ-1's manual as being phase distortion synthesis's equivalent of the VCF (voltage-controlled filter) in analogue synthesizers. The DCW can be modified over time using an ADSR envelope, thus changing the timbre of the sound over time. The DCW of an oscillator is the magnitude of distortion that is applied to the reading angle of that oscillator's selected waveform. Each of the oscillators in a two-oscillator patch could be independently programmed. The CZ-3000, CZ-5000, and CZ-1 had sixteen digital oscillators, making them sixteen- or eight-voice synthesizers. For patches using one oscillator per voice, this allowed 8-note polyphony, but if two oscillators per voice were used, this restricted polyphony to four voices. The CZ-101 and CZ-1000 had only eight digital oscillators. It was possible to combine two non-resonant waveforms together, and to combine a resonant waveform with a non-resonant waveform, but it was not possible to combine two resonant waveforms. This could cause the appearance of a sub-harmonic one octave below the nominal pitch of the sound, due to the period of the combined waveform taking twice as long as a single waveform would. Unlike other synthesizers, where having multiple waveforms caused those multiple waveforms to be mixed together (parallel), the CZ synthesizers would play one waveform and then play the other, and so on in alternation (series). The simulated filter resonance was not considered to sound much like real filter resonance, being a simple waveform at the filter cutoff value instead of a real filter resonating.Įach digital oscillator could have one or two waveforms. However, the CZ line used phase distortion to somewhat simulate an analog filter, it had in total eight different waveforms: as well as the standard sawtooth, square, and pulse waveforms, it had a special double sine waveform, a half-sine waveform, and three waveforms with simulated filter resonance: resonant sawtooth, triangle, and trapezoidal waveforms. Also non-resonant waveforms 1~5 can cascade with other waveforms, and as a result, 33 waveforms (basic:8, cascade:25) are available. Like the CZ-101, this synthesizer had 49 keys.

It was also somewhat larger than the CZ-101. This synthesizer, introduced in 1985, was identical to the CZ-101 in function, but used full size keys and more attractive membrane buttons.

The CZ-1000 was the second fully programmable phase distortion synthesizer that Casio introduced.

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