Fernando: I dunno, I just had an extra VCA so I wired this up in about 5
minutes. It was that or have the VCA just sit there doing nothing so I
wired it! If I ever pull the module out again I will look to see if I
drew this different than how I wired it up, I don't think I did but I
am not certain.
I think you could use a switch instead of the pot mod I show....I also was
thinking you could replace the pot entirely with a VCA probably, and then
use a continous VC feed to the VCA to set the "baseline" feedback you
want, with CV mod further adjusting things. If you go down that route,
you may want to experiment with some sort of resistance (250 ohm? Don't
know) in parallel with the VCA. Probably depends on the exact VCA you
use. Not sure about this, but, that's where I'd start anyway, for what
that's worth. Have fun!
minutes. It was that or have the VCA just sit there doing nothing so I
wired it! If I ever pull the module out again I will look to see if I
drew this different than how I wired it up, I don't think I did but I
am not certain.
I think you could use a switch instead of the pot mod I show....I also was
thinking you could replace the pot entirely with a VCA probably, and then
use a continous VC feed to the VCA to set the "baseline" feedback you
want, with CV mod further adjusting things. If you go down that route,
you may want to experiment with some sort of resistance (250 ohm? Don't
know) in parallel with the VCA. Probably depends on the exact VCA you
use. Not sure about this, but, that's where I'd start anyway, for what
that's worth. Have fun!
On Wed, 24 Nov 2004, Fernando wrote:
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>
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> Thanks Josue, I imagine it could be possible externally. I was looking at the
> schematic when I frst posted the question. Just wanted some "real life" report about how it
> worked. I does not seem so evident as with other filter designs...
>
> Charlie, your mod looks cool and minimal, thank you. May be one could implement just a
> switch and two sockets to your resistors to switch between "normal" and external
> (ext. VCA) resonance control...
> That would be a minimum modification / maximum satisfaction =:)
> Anyhow, am I wrong or the pot legs are swaped in your drawing? One should send the
> wiper to the VCA as I understand from CGS35 schematic...
>
> Fernando
>
> > Yes You can do VC resonance this way. Just remember to invert the
> > signal, using an inverting VCA (-input) or using a spare inverter. This
> > is the way for VC Res from the 70`s....
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> See the following URLS for the CGS Modular Synth home page:
> Main: http://www.cgs.synth.net/
> Secondary: http://otherunicorn.0catch.com/synth/
> Yahoo! Groups Links
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