The PolySix has a linear DAC for note selection, and a single exponential converter for all six voices to convert the linear DAC voltage to an exponential one. If all six voices are off, then it could be that the exponential converter is a little off. But it's somewhat tricky to adjust, so maybe better to just leave it as is, or adjust the voice tunings instead. Hard to say which is off without measuring voltages for various keys. Bob
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Re: [PolySix] Is there a VR trimpot for overall tuning of the entire Polysix keyboard
2017-04-24 by Bob Grieb