Discussion about the Korg PolySix synthesizer

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 !