Discussion about the Korg PolySix synthesizer

I fixed it !

Just as I thought the problem was a faulty 4066 IC lays (probably) at 
the EG section of the 2nd oscillator.


--- In PolySix@yahoogroups.com, "gil_we" <gilwe@h...> wrote:
> Oh, and I forgot to mention that the problemtic note actually plays 
> well for a few seconds when I turn on the synth, and only than 
starts 
> to sound odd. It this temperture related ? I can try using cooling 
> spray on those parts.
> 
> 
> 
> 
> 
> 
> --- In PolySix@yahoogroups.com, "gil_we" <gilwe@h...> wrote:
> > Glad to hear you found the cause for the problem !
> > 
> > Actually  have a much similiar problem on my Kawai SX-210 (great 
> > synth BTW),
> > 
> > One of the 8 notes it can play (oscillator) will always sound 
> duller 
> > than the other 7. Actually, it is like the EG (the filter's ADSR) 
> > won't effect on it. When you play some chord that contains the 
> > problemtic note, the whole sound will sound scattered (ta ta ta 
ta 
> ta)
> > and as you tweak some parameters on the EG (ADSR) it will sound 
> > faster or slower (the "tatatatata" sound).
> > 
> > I was mainly focued on the computer board as the problems started 
> > when the battary (placed on that board) has leaked all over, so I
> > had to reaplce some parts and rewire many traces,
> > 
> > But now it looks like the problem should lay on the 2nd 
oscillator 
> > (that's the one that sounds different). Is that right ?
> > 
> > I noticed the audio circuit uses the same SSM2044 chips (for 
> > filters?) but no 2056 chips. Instead there are a few CD4066BE 
chips 
> > for every oscillator. Is that the EG chip ? 
> > 
> > I saw that the Moog Taurus uses the same CD4066BE chip on the 
> > Filter/VCA/Envelope circuit... like on the following link -
> > 
> > http://home.debitel.net/user/jhaible/jh_minotaurus_1.pdf
> > 
> > Thanks everyone for any advice !