Yamaha PSS-50

The Yamaha PSS-50 is a portable synthesizer keyboard released in the early 1980s. It was used by a variety of artists, including the likes of Depeche Mode, New Order, and The Cure. The PSS-50 is a monophonic synthesizer with a built-in speaker, and it features a single oscillator with a range of waveforms, an envelope generator, and a low-frequency oscillator. It also has a built-in chorus effect and a portamento function. The PSS-50 is powered by four AA batteries and can be connected to an external amplifier or mixer.