Korg M-500 Micro Preset

“Up for auction today is a Vintage Morg M-500 Synthesizer. I got this at an estate sale. I plugged in a pair of headphones and the keyboard played. It appears all the knobs function except for 1. It is the Monentary / Portamento on switch is broke. (See pics) I have no other way of confirming if the keyboard can play thru an amp. Dusty and used. Made in 1977. Thanks for looking!”
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