Discussion about the Korg PolySix synthesizer

Worked for me too. But I was wondering. If you are jumpering the signal
directly to output, bypassing the VCF chip, is it at all necessary to
remove the chip? 

/Frank

On Tue, 2013-08-13 at 23:58 -0500, james meagher wrote:
> The link worked for me. And thanks for posting this - I'm very excited
> about this mod. I was about to do it last week, but when I fired up my
> PolySix for the first time in months, I found that it no longer wants to
> produce sound . . . ah, vintage.
> 
> But seriously, as soon as I have time to trouble shoot this issue I'll be
> performing this mod.
> 
> Cheers,
> James
> 
> 
> On Tue, Aug 13, 2013 at 8:43 PM, chipaudette <chipaudette@yahoo.com> wrote:
> 
> > **
> >
> >
> >
> > I decided to make my "non-destructive" modification a bit more
> >
> > permanent. I removed the clip lead and, in its place, I soldered in a
> > jumper wire. Now the synth is more robust and will better tolerate the
> > rigors of travel. If I wish to un-do the mod, it's still pretty easy to
> > reverse.
> > (I'm trying the new "Rich Text Format" interface for the Yahoo Groups
> > "Post Message" page. Let's see if it makes the link work
> > correctly...)http://synthhacker.blogspot.com/2013/08/polysix-permanently\
> > -removing-post.html<http://synthhacker.blogspot.com/2013/08/polysix-permanently-removing-post.html>
> >
> >
> > <http://synthhacker.blogspot.com/2013/08/polysix-permanently-removing-po\
> > st.html<http://synthhacker.blogspot.com/2013/08/polysix-permanently-removing-post.html>
> > >
> > I hope that you're all having a good Summer!
> > Chip
> >
> > --- In PolySix@yahoogroups.com, "chipaudette" wrote:
> > >
> > >
> > > Here's a full post showing how the mod can be done. I give schematics
> > and some pics and the basic audio demo that was linked earlier:
> > >
> > >
> > http://synthhacker.blogspot.com/2013/07/polysix-bypassing-post-effects-v\
> > cf.html<http://synthhacker.blogspot.com/2013/07/polysix-bypassing-post-effects-vcf.html>
> >
> > >
> > > At the end, I also analyze the background noise in each condition. I
> > found that defeating the post-effects VCF by forcing open the filter
> > actually *lowers* the noise from 100-1000Hz compared to the stock synth.
> > But, it also exposes more of the synth's noise above 2 kHz, as expected.
> > >
> > > By removing the VCF (by pulling U15 and jumpering to R168), though,
> > you get the lower noise value in the 100-1000Hz range *and* you get only
> > a very slight increased in noise above 2kHz. Win-Win!
> > >
> > > Chip
> > >
> > > --- In PolySix@yahoogroups.com, "chipaudette" chipaudette@ wrote:
> > > >
> > > >
> > > > Here's a sound demo of the mod that we've been discussing. It's a
> > very basic demo, but you'll definitely get the idea of how
> > defeating/removing this VCF really opens up the sound...
> > > >
> > > > https://soundcloud.com/synthhacker/korg-polysix-sound-of-removing
> > > >
> > > > Pretty dramaitc, eh? I call this one "The Snappy Mod". And,
> > because it can be done non-destructively, I highly recommend it!
> > > >
> > > > A full post with schematics, pics, and graphs will come later.
> > > >
> > > > Enjoy!
> > > >
> > > > Chip
> > > >
> > >
> >
> > [Non-text portions of this message have been removed]
> >
> >  
> >
> 
> 
>