Korg Synth Pedal Analog Guitar Synthesizer FK-1

via this auction

"Vintage 1970s analog synthesizer by Korg.

Bottom Plate reads:
Korg Synthepedal
Model FK-1
AC 117V 50/60 HZ 5 Watts
Serial No. 750802
Manuf. by Keio Electronic Lab.,
Corp. Tokyo, Japan
For: Unicord Incorporated
Westbury, New York

All controls and jacks are located on the top panel:
Input, Output, Remote
Expand: Threshold, Max
Bright, Balance (direct/effect mix),
Manual/Remote switch
2 "Traveler" faders
Power lamp
On/Volume knob

There is no "bypass" switch, the unit is either on or off."