Discussion about the Korg PolySix synthesizer

On my poly six one of the six voices is louder than the rest and 
slightly distorted.  I swapped the filter and sound generating chips 
between voices and there is no difference.  Any ideas?

----- Original Message -----

From: "ghwelles" <GHWelles@bbklaw.com>

> On my poly six one of the six voices is louder than the rest and 
> slightly distorted.  I swapped the filter and sound generating chips 
> between voices and there is no difference.  Any ideas?

no difference as in that chipset is still louder, or that "channel" is still louder.  I'd think the chips would either work or not...  Aren't there volume pots for each channel?
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Good point:  the same channel stays louder regardless of what chipset 
is in it.  The volume pot idea is interesting, which pot controls the 
voice channel volumes?  I know which pots work for tuning, but not the 
volume.  Does the service manual address this?  Where would I get a 
copy of the service manual?  

Also, when I play a note it will start to oscillate if held too long, 
what would casue this?  The oscillation wheel works fine, this is 
something else.


--- In PolySix@yahoogroups.com, "Chromatest Pantsmaker" 
<chromatest@g...> wrote:
> 
>  no difference as in that chipset is still louder, or that "channel" 
is still louder.  I'd think the chips would either work or not...  
Aren't there volume pots for each channel?

> -- 
> _______________________________________________
> Get your free email from http://www.graffiti.net
> 
> Powered by Outblaze

----- Original Message -----

From: "ghwelles" <GHWelles@bbklaw.com>

> The volume pot idea is interesting, which pot controls the 
> voice channel volumes?  I know which pots work for tuning, but not the 
> volume.  Does the service manual address this?  Where would I get a 
> copy of the service manual? 

Have you looked at oldcrows.net?  I don't know that there are individual volume adjustments...
 
> Also, when I play a note it will start to oscillate if held too long, 
> what would casue this?  

open the case with power off, flip the switch in there to turn on test-mode and power up.  does the note still oscillate?  My first guess is that it is part of the "patch" that causes it to make that sound.  Putting it into test mode circumvents the patches...

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There arent any individual volume pots. It might be well that one of
the transistors which form the VCA is gone. Check Q5 and Q6 (standard
although matched small signal npn transistors "2SC945"). You can skip
the filter chip: remove it and then make a wire from pin1 to pin3 of
the empty socket. Still distorted? Is SAW and PULSE louder than other
voices? This should be easy to find with an oscilloscope and the
schematics, but rather difficult without ...
Good luck!

PolySix@yahoogroups.com wrote:

> On my poly six one of the six voices is louder than the rest and 
> slightly distorted.  I swapped the filter and sound generating chips 
> between voices and there is no difference.  Any ideas?
> 
> 
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Thanks, I will look into it.

>>> jo.synth@crossnet.at 05/23/03 12:40PM >>>
There arent any individual volume pots. It might be well that one of
the transistors which form the VCA is gone. Check Q5 and Q6 (standard
although matched small signal npn transistors "2SC945"). You can skip
the filter chip: remove it and then make a wire from pin1 to pin3 of
the empty socket. Still distorted? Is SAW and PULSE louder than other
voices? This should be easy to find with an oscilloscope and the
schematics, but rather difficult without ...
Good luck!

PolySix@yahoogroups.com wrote:
> On my poly six one of the six voices is louder than the rest and 
> slightly distorted.  I swapped the filter and sound generating chips

> between voices and there is no difference.  Any ideas?
> 
> 
> 
> To unsubscribe from this group, send an email to:
> PolySix-unsubscribe@egroups.com 
> 
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
> 
> Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/ 
> 
> 
> 
> .
> 



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