Published on Sep 23, 2019 Joseph McGinty
"Here is a brief demonstration of the EML Polybox, a keyboard accessory that would allow you to play chords on a monophonic synthesizer."
via this auction
"For your consideration is an extremely rare EML Polybox. The Polybox allows you to play chords on your monophonic synthesizer. It is in very good working condition. It has been serviced by Ake Stromer of Stromertronics in Brooklyn. It includes the owner's manual and schematic."
EML Polybox demo.
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