MicroRhythm along with MicroDisco, MicroLatin, MicroVocals and MicroTuned was part of a set of music creation software (then advertised as games) developed by Simon Pick (developer of Daredevil Dennis and Rod Land on NES) for Commodore 64/128.
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The game was rapidly developed over a two-week period while Simon was a student at the University of Sussex, using samples from the Roland TR-707 drum machine as the audio source.