Sequential Circuits Pro-One

The Sequential Circuits Pro-One is an analog monophonic synthesizer released in 1981. It was the first synthesizer released by Sequential Circuits and was designed by Dave Smith. It is a subtractive synthesizer, meaning it uses oscillators, filters, and envelopes to create sound. It has two oscillators, one filter, one envelope generator, and one LFO. It also has a built-in arpegiatior and a 32-note keyboard.

The Pro-One has been used by a variety of artists, including Depeche Mode, The Cure, and New Order. It is known for its warm, analog sound and its ability to create a wide range of sounds. It is also known for its portability, as it is relatively small and lightweight.