Geiss Digisequencer

The Geiss Digisequencer is a hardware MIDI music sequencer used by the musician Jean-Michel Jarre. It is the successor of the Matrisequencer. The French custom-built Digisequencer was designed by Michel Geiss and Jean-Claude Dubois. The sequencer was built around the components of an Atari ST computer. The unit features a realtime view of the pattern being played.
See also.
Matrisequencer