Discussion about the Korg PolySix synthesizer

If you have the widely circulating service manual (the one from the file
section) you'll find the correct tuning instructions for your board (which
is the older one). The addendum in this manual also gives the revised
tuning procedure for the new board (which also explains in part what the
other pots are doing then).

The Polysix went through two major different revisions for the voice board.
The one with the daughter board is the old revision.