Sequential

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.

The Prophet-5 is an analog synthesizer. It was designed by Dave Smith and John Bowen in 1977, who used microprocessors, then a new technology, to create the first polyphonic synthesizer with fully programmable memory.