Discussion about the Korg PolySix synthesizer

Glad you got it sorted out.   Maybe the sub osc divider (4027) flip flopswere ignoring the signal that is supposed to shut them off, and running all 
the time on that voice?   Even so, you shouldn't hear it until that voice'sVCA opens up.

As the same note moves between the different voices in your demo, 
we can hear the pitch change a little.   I think if you tune up the voicesyou can get them to be closer to each other than what you have right now.
The sub osc signal is a square wave, that is in sync with the osc for thatvoice since it is clocked by it.   It's just summed in with the other waveform.
Bob



      From: "mpe1969@tpg.com.au [PolySix]" <PolySix@yahoogroups.com>
 To: PolySix@yahoogroups.com 
 Sent: Saturday, May 9, 2015 7:04 AM
 Subject: Re: [PolySix] Re: Key assign mode issue
   
    Thanks Bob. I have uploaded two new photos (which have the correct labelling - 2volts per cm) I am using a 10-1 probe. The good news is I have solved the problem!I hope this makes sense. I watched the oscillator diodes. The distorted note always stopped when the sixth oscillator got to play the note. So then I would play a low note six times and then a higher note, which would be distorted until it reached to the sixth oscillator.I took some photos of this distortion (probing resistor 149)As mentioned in an earlier post, the sixth oscillator was also the one which lifted an octave rather than add a sub octave, when the sub octave was selected. I probed around the 4027 on osc 6 and it looked very different to what was happening on the other oscillators. (sending out a wave twice the frequency).I put in a new 4027 today and it fixed both problems (the sub octave and the distortion)I have uploaded a more basic sound demo- (you can count the 5 distorted notes then the clean 6)sequence:6 low 5 distorted  high 1 clean high6 clean high repeated twiceAnd added some more photo's ( I realised afterwards that I still had the osilloscope set on dc......but it shows the problem at leastThanks again to everyone for helping out. Thanks Bob for helping me understand my old oscilloscope a little better.If anyone understands why a faulty 4027 would cause this effect, I'd love to know.
I will probably have other issues but if they are unrelated to the klm366, I will start a new thread.