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Please see Wikipedia for details.
Excerpt from Wikipedia:
Sequential is an American synthesizer company founded in 1974 as Sequential Circuits by Dave Smith. In 1978, Sequential released the Prophet-5, the first programmable polyphonic synthesizer, used by artists including Michael Jackson, Madonna, and John Carpenter. Sequential was also pivotal to the development of MIDI in 1982, which synchronizes electronic instruments by different manufacturers.
In 1987, Sequential went out of business and was purchased by Yamaha. Smith continued to develop instruments through a new company, Dave Smith Instruments. In 2015, Yamaha returned the Prophet and Sequential Circuits brands to Dave Smith Instruments, which rebranded as Sequential in 2018.
Country : USA
Founding year : 1974