In 1963, their new company Keio-Giken (later Korg) released their first rhythm machine, the Donca-Matic DA-20, using vacuum tube circuits for sounds and a mechanical wheel for rhythm patterns. It was a floor-type machine with a built-in speaker, and featured a keyboard for manual play, in addition to the multiple automatic rhythm patterns. Its price was comparable with the average annual income of Japanese at that time.
