Keio Gijutsu Mini Pops Analog Drum Machine

The drum machine was the first model in Keio's Mini Pops series. The company already had an electro-mechanical drum machine on the market with the Donna Matic DA-20 (1063). However, the instrument is a heavy piece of furniture. It is possible that Keio was reacting to its competitor Ace Tone, which presented the small FR-1 Rhythm Ace at NAMM 1964. This was built using the new transistor technology. The rather simply equipped Mini Pops, which probably appeared as early as 1965, was given a similar technical design. Its advantage was that it could be easily attached to an organ, which made it easier to operate. This was followed in 1966 by the Mini Pops 5 and 7 desktop models and the Donca Matic Rockmate from Keio.

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The Mini Pops in transistor technology has three separate PCBs for the power supply, the pattern generator and the voice circuits.
It has 16 patterns: Waltz, Samba, Cha-Cha, Mambo, Rumba, Beguine, Habanera, Tango, Blues, Rock-Beat, Bossanova, Rock-a-Ballard, Swing, Six Eight, Fox Trot & March-Polka. To combine up to 3 patterns at the one time. Tempo, cymbal and volume are adjustable.