Discussion about the Korg PolySix synthesizer

ARP, POLY, UNI, CHORD, and HOLD are all driven by the key assigner CPU
via 4174 chip IC2 on the KLM-366 board.   Is the key assigner CPU working 
at all?   Do the voice LED's respond when keys are pressed?   Do any of those
LED's change if you press switches?   I guess you could try re-seating the key 
assigner CPU in its socket if not, although you'd be pretty lucky if that 
had any effect.  Maybe check the voltage on the reset input to the key assigner
(pin 4) and make sure it's high (above 2.4 volts)   If not, then that chip will be held
in reset and won't turn the LED's off or do anything else for that matter.

Bob