The Korg Rhythm 55 is a vintage rhythm box from 1979.
The Korg Rhythm 55 (KR-55) is a non-programmable analog rhythm box. The KR-55 and its little brother KR-33 were the successors of the Korg Minipops series.
This video, via AnalogAudio1, offers a quick demo of the sound and features of the Korg Rhythm 55.
About The Korg Rhythm 55
The KR-55 has some special features: a TRIG OUT jack including several triggering modes, SHUFFLE function and volume faders for the most drum sounds.
The rhythms are not mixable like on earlier Korg rhythm boxes (Minipops series), but TEMPO and VOLUME controls allow for some tweaking.
The Korg Rhythm 55 was used by Jean-Michel Jarre (Magnetic Fields) and Depeche Mode (Speak and Spell) among others.