Yamaha PSR-21

Yamaha PSR-21 is a portable keyboard synthesizer released by Yamaha in the late 1980s. It is a 61-key instrument with a built-in sequencer and a variety of sounds and effects. It has been used by many artists, including the likes of Depeche Mode, The Prodigy, and The Chemical Brothers.

The PSR-21 has a variety of features, including a built-in sequencer, a variety of sounds and effects, and a built-in arpeggiator. It also has a built-in rhythm machine, a pitch bend wheel, and a modulation wheel. It also has a built-in microphone input, allowing users to record their own sounds. Additionally, it has a variety of preset sounds, including piano, organ, strings, and drums. It also has a variety of effects, including reverb, chorus, and delay.