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"This is a vintage,original Korg Donca Matic Rockmate Drum Synthesizer Machine produced in 1966 in Tokyo,Japan and distributed by Olson Electronics in the United States. This was one of the first all-electronic solid state drum rhythm machines made. The company was originaly called "KEIO Gijutsu Kenkyujo Limited" when this was made before it became the Korg company. The case is made out of metal and measures 7.5" x 7.5", by 1-1/4" deep. One of the black inserts is missing from the volume knob and t are scratches on the case (refer to the pictures). All functions on the unit still work perfectly and it is powered by a 9-volt battery (not included) and it also has an AC adapter jack on it.
Works great! everything no distortion."
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