Discussion about the Korg PolySix synthesizer

The mod wheel is always connected to the VCO, and never to VCF or VCA,
unless someone had made other modifications to the KLM-367.

The LFO has two outputs labeled "A" and "J" on the circuit diagram (bottom
right corner). The "A" signal goes to CN06 pin 1 out to the mod wheel and
back in pin 2. From there it goes directly to the VCO MOD circuit on IC8.
The "J" signal is controlled by the VCO/VCF/VCA switch and sends the amount
selected by the Level control in the MG section to the correct destination.

 

This doesn't sound like the way you expected it to work, but that's how it
was designed. Changing the Mod Wheel should never affect the filter or amp.

 

Don B.

 

 

  _____  

From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
djangowes
Sent: Thursday, May 17, 2012 11:06 AM
To: PolySix@yahoogroups.com
Subject: [PolySix] Re: Modwheel VCO VCF VCA Issue

 

  


Ok. after some searches, I'm pretty sure it comes from the KLM367. My P6 had
a battery leak then has been repaired before I have it.
I'd like to know where is produced the LFO signal. (what part of the
circuit). Then the idea would be to follow the signal and find the place
(crossroads) where it has to choose between VCO, VCA or VCF.
Anybody knows?

thanks,

--- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> ,
"djangowes" <djangowes@...> wrote:
>
> Hello all,
> 
> I've had a P6 for a year and I there is an issue about the modwheel.
> What it does is:
> _when Mod switch is set at VCO, then modwheel affects VCO pitch. It's OK.
> _when Mod switch is set at VCF, modwheel modulates VCF AND VCO... KO.
> _when Mod switch is set at VCA, modwhell modulates VCA AND VCO... KO.
> 
> So the two last position shows an issue. It is not supposed to modulate
VCO each time.
> On the other hand it works nice when using MG with pots on control panel.
> 
> Modwheel is linked to KLM369 then signal reaches KLM367.
> Problem with modswitch? I wonder where i should start to find the culprit.
> Does anybody know when the issue could come from?
> Thanks for any kind of help.
> 
> rgds,
> 
> Ed.
>





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