Sequential Circuits Inc. (SCI) was a California-based synthesizer company that was founded in the early 1970s by Dave Smith, and sold to Yamaha Corporation in 1987. Throughout its lifespan, Sequential pioneered technologies and design principles that have served as a foundation for the development of modern music technology. Sequential was also pivotal in the planning, design, and support of 1982's groundbreaking innovation in electronic music, MIDI.
Following the purchase of Sequential Circuits by Yamaha, Dave Smith continued to develop musical instruments through Dave Smith Instruments.
In January 2015, he reacquired the rights to use the Sequential brand name from Yamaha president Takuya Nakata.
As of 31 August 2018, Dave Smith Instruments was rebranded as Sequential.
DSI is Now Sequential!