Korg Poly-61 Voice-Board OP

KLM-??? (Voice Board OP)

(click image for large version)

This is the old production version of the voice board. It holds the 6 voices, each consisting of 2 very different DCOs, one VCF and one EG. Besides this, there is also some global circuitry for handling the control voltages of the EGs.

For calibration, the following spots are important (1 of 4 visible voices labeled in the right image)

1 - Test point for DCO1 output	1 - FC ADJ - adjust filter cutoff frequency
2 - DCO1 CV input	2 - RES ADJ - adjust filter resonance level
3 - Clock input for digital control of DCO1/DCO2	3 - VCA ADJ - adjust VCA output level
	4 - Gate connector
	5 - EG ADJ - adjust envelope generator speed

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