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.
MicroRhythm used real sampled sounds and was essentially a drum-machine that had the same layout as other micro-versions.
Simple Flam effect and Pitch adjust for every sample were also possible, as well as the main tempo change.
Each micro version had unique sets of sounds, thus producing different genres of tunes.
It was possible to save projects to audio tape via C64 cassette-recorder or disk unit, and load them later in program for additional editing or even analog output mixing.