Need to have details on a musical keyboard / synth? "MK" (brand)? / MK-2055a (model) that I purchased @ Yard Sale?

Keyboard music lessons on Marimba plans: concern K6056 ? Need to have details on a musical keyboard /? Synthesizer "MK" (brand) / MK-2055a (model) that I bought @ Yard Sale Seeking for details on a music keyboard "MK" (brand) / MK-2055a (model), I purchased @ Yard Sale. This is an addition to the trademark ensignia standalone word "MK". I tried to search the globe by means of Yahoo and found some results, the Chinese web sites musical equipment they have on the market shows, nonetheless, I

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