via this auction
via the listing: "The synth has had a DB-15 connector and an on/off switch added by a former owner. I do not know what these do and have not noticed any impact to the function of the synth. My guess is that these tapped into the keyboard matrix so that you could play the synth from an accordion or other similarly equipped instrument. But I didn't perform this mod. You just need to know the mods are there..."
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