Discussion about the Korg PolySix synthesizer

Hi Peter,

So we'll assume the changing those two components made no difference 
and you are still left with the original problem? Can you confirm that 
all of the voices appear as off key as one another? (i.e, put the P6 
into unison mode, turn the cutoff to 10 and press C3 over and over and 
compare each voice, etc. They all sound just as bad as one another?)

if so, check section 8 of the service manual and make sure all of the 
voltages are within spec. Make sure the supplies to IC17/18/19 are 
accurate. Also, make sure that demultiplexer IC31 is doing its job. 5V 
should appear alternately on pins 13, 14, 15, 12, 1 and 5 when C8 
pressed. Have a look around this part of the circuitry on the KLM-366 
board and see if the voltages look correct. 

Report back your findings and we'll have another head scratch if all 
looks well.

Cheers,
Andy

--- In PolySix@yahoogroups.com, "hjulskov" <hjulskov@...> wrote:
>
> My PolySix suddenly got out of tune, so I changed PC-1 to a VTL5C3 and
> R93 to a 1K2 resistor. However the PolySix still sounds terrible.
> Any suggestions for what to look for ? 
> I have a multimeter if there is anything you suggest me to check.
> 
> Thanks in advance,
> Peter
>