Discussion about the Korg PolySix synthesizer

I checked the DAC value at IC9-1 during time slot 6.  It's always the same and corresponds to the very top C key when the octave switch is in the 4' position.  On my unit it's about 3.6 volts.   So the opto-coupler circuit would be looking at the conversion of that voltage.   Those two long RC's explain why notes played during the first few seconds after power up are sliding around.



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