Yamaha YS100 is a digital synthesizer released by Yamaha in 1985. It was used by many popular musicians, including Depeche Mode, New Order, and The Cure. The YS100 is a hybrid synthesizer, combining both analog and digital components. It features two oscillators, two envelope generators, two low-frequency oscillators, and a 24-voice polyphonic synthesizer. It also has a built-in sequencer and a variety of effects, including chorus, flanger, and delay. The YS100 is capable of producing a wide range of sounds, from classic analog synth tones to modern digital sounds.