Discussion about the Korg PolySix synthesizer

Hello everyone;

I'm trying to figure out what exactly the various trimmers do and how they
interact.
While I've read through the group archives and think I got the basic
procedure I'm still not completely happy with the tuning of my Polysix.
It's mostly within the 5 cent mark but I still hope I can improve on this.

Let me see if I got this right:

VR1, VR2 and VR3 basically affect the CV coming from the key assigner
circuit. VR10 and VR11 for each voice determine how the voice reacts to the
CV.

So my assumption is that VR3 basically tunes the very low end (16', C1)
while VR2 should tune then the very high end (4', C6). This in theory
should result in VR1 tuning the very middle (8', C3 to C4).

So where does VR15 come in? What's the difference to VR1? How does it
interact with VR1? The description from the service manual seems to hint
that VR15 is heavily used for the tuning.

My problem is that I can get C2 and C6 pretty easily to be in tune, but
then usually C3 to C5 are somewhat off. So far I've tried various
combinations but I notice very little difference.


-- 
Malte Rogacki