This is my take -first time ever- on a Casio CZ. It's a really underrated Phase Distortion synthesizer. to me, It sounds almost on par with 4 opFM synths. and maybe 6op
The Fundamentals of Phase Distortion Synthesis — Pro Audio Files
6 of the best FM, additive and phase distortion synths
Casio CZ3000 - The Obvious Solution? (SOS Apr 86)
Difference between phase distortion, phase modulation, and frequency modulation