"The Drum Computer (or Percussion Computer) from Movement Computer Systems is a very rare British made drum machine circa 1981. It is estimated that only 30 or so units were produced. It combines analog synthesized drum sounds (Simmons style) and digital 8-bit sampled drum sounds (LinnDrum style). There are seven voice cards, each with two drum voices, for a total of 14 drum voices. Each drum voice can be switched between either the analog (syn) or digital (real) mode and has its own Volume and Pitch-Sustain control knobs."