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-vcf.htmlAt 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
>