Discussion about the Korg PolySix synthesizer

The chip could be bad.  Another thing you could try would be 
to (carefully) measure the DC voltage at these three pins with a DMM when the synth 
is powered.  You should see some voltage other than 0V or 5V, as the signals
should be changing and the meter will respond to the average.   Actually, 
if you use a DMM, the voltage values may jump all over the place due to the 
meter sampling, but at least that would tell you that the signals are changing 
at the chip, which is a little more definitive than measuring the resistance.

If it's easy for you to change the chip, then that would be something to try.
I can't say for sure that it's the problem.   Tough to diagnose things by email...

Good luck.

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On Tue, 5/2/17, peterovesterlund@gmail.com [PolySix] <PolySix@yahoogroups.com> wrote:

 Subject: Re: [PolySix] Envelope generator problem
 To: PolySix@yahoogroups.com
 Date: Tuesday, May 2, 2017, 8:30 AM
 
 
  
 
 
 
   
 
 
     
       
       
       Thank you for your answer Bob, I really appreciate
 it.And it sounds like the problem is somewhere in
 that area after your description about how A, B and C
 works.
 But today I
 measured both A, B and C line all the way from the MUX to
 the respective leg on the CPU, and it is full contact all
 the way.I dont have a scope so I cant check the
 MUX switching.Can it be the MUX itself that are
 broken maybe?
 I tried
 the control pots again and the Cutoff and the Decay makes
 almost exact the same changes in the filter.
 Peter
 
 
 
 
 
 
 
 
 
 
     
      
 
     
     
 
 
 
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