The Yamaha CS-80 is an analog synthesizer introduced in 1977. It supports true 8-voice polyphony, with two independent synthesizer layers per voice each with its own set of front panel controls. It has a layered keyboard that is both velocity-sensitive and pressure-sensitive, with polyphonic aftertouch and a ribbon controller for polyphonic pitch-bends and glissandos. Production of the instrument ceased in 1980.
The Yamaha DX7 is a landmark instrument — not for its playability or depth, but for delivering a new kind of digital clarity at scale. It trades expressiveness for precision, intuition for architecture, and warmth for brilliance. Its legacy is sonic, not ergonomic.
The Yamaha SY99 is a 1991 hybrid digital synthesizer combining FM, sample-based, and subtractive synthesis. It enables PCM samples to function as FM modulators, controllable via velocity, aftertouch, wheels, pedal, and breath controller. It improves on the SY77 with a 76-key keyboard, expanded ROM, user-loadable PCM samples usable in FM synthesis, and an SPX900-derived real-time controllable effects processor.