Surviving Univox MR-12 machines show a twelve-position rhythm selector, tempo and volume knobs, and a start/stop switch. A dealer’s specimen description and later software demonstrations preserve further details of its compact percussion voice set. Related eight-rhythm advertising does not date this particular model.
Surviving instrument
A small Japanese rhythm box, still legible.
The MR-12 listing photographs give the reader the important things first: the Univox badge, the compact control panel and the machine as an object made for a player’s hands.
See the MR-12 photographs ↗The machine in the record
Synthmania / a user-bank afterlife.
Synthmania’s Hammerhead demonstration uses a Univox Micro-Rhythmer 12 user bank, carrying the small preset machine’s sounds into later software rhythm making. It is a modern sampled recreation, not a vintage release claim, and a direct account of preservation through use.
Read Hammerhead — software review and user-bank demonstration ↗On record
- Synthmania — Hammerhead Micro-Rhythmer 12 user-bank demonstration. Synthmania’s Hammerhead demonstration uses a Univox Micro-Rhythmer 12 user bank, carrying the small preset machine’s sounds into a later software rhythm context. Source ↗
Twelve rhythms in a small case
Choose one of twelve selector positions, set the tempo and volume, then start the rhythm with the switch. The photographed MR-12 puts those everyday controls on its small case. BEP’s description of another surviving example lists five voices: bass drum, snare, claves, hi-hat and cymbal. It is a compact accompaniment setup with a short route from choosing a rhythm to hearing it.
Univox MR-12 Micro Rhythmer early 80s Japan — archived specimen listing ↗ Univox MR-12 Micro Rhythmer 12 ↗
A panel made for adjustment
The dealer also describes three trimmers inside its MR-12: one for the claves’ decay, one for sound balance and one for tempo adjustment. It reports that the claves trimmer can reach self-oscillation. These are internal adjustments in that specimen, separate from the selector, tempo and volume knobs used in ordinary playing.
Univox MR-12 Micro Rhythmer early 80s Japan — archived specimen listing ↗
Small rhythms, sampled again
A May 1980 Super Micro-Rhythmer advertisement offered eight rhythms for practice and performance, a neighbouring compact format whose exact suffix remains unclear. The MR-12 also acquired a software afterlife: Synthmania’s HammerHead account demonstrates a downloaded Micro-Rhythmer 12 user bank. Its sampled percussion could be arranged in the software’s step grid, giving the little box’s sounds another way to make a rhythm.
Imperial Creations Super Micro-Rhythmer advertisement ↗ Hammerhead — software review and user-bank demonstration ↗ Univox Micro-Rhythmer 12 sample-archive listing ↗
Sources
The visual archive
Further visual evidence.
Sources for images shown earlier (1)
Additional visual sources (1)
Original publications and related image sources.
- BEP Univox MR-12 listing photographs ↗
listing date · BEP Boutique Effect Pedals · Nine listing images; model-label inspection pending