[sdiy] CV-vactrol circuit

[niroke at tampabay.rr.com]

Mattias,

I'm not sure of anything, I suppose.  I just assumed if it were that easy to add CV controls, someone would have produced a lot by now.  The Analogue Solutions kit adds two CV inputs for pitch, but I tried that and it wasn't very good at all.  


Richie, 
I'm sure it's a dawdle for you to bang out, but it's above my level of understanding/guesswork.  Where can I learn more about this?  "MIDI Mods for Dummies"?  It sounds like a winner

Thanks everyone!

Nick



--- Richie Burnett <rburnett at richieburnett.co.uk> wrote: 
> Digital pots sound like a better idea to me.  If you add a low-end 
> micro-controller you can have the choice of either CV control or MIDI 
> control.
> 
> -Richie,
> 
> 
> -----Original Message----- 
> From: Gordonjcp
> Sent: Friday, July 03, 2015 11:46 PM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] CV-vactrol circuit
> 
> On Fri, Jul 03, 2015 at 08:58:51PM +0000, niroke at tampabay.rr.com wrote:
> > I'm trying to add external control to my TR-9090's voice parameters, and 
> > I'm sure if that was as simple as patching in to a CV summing point, it 
> > would have been done by now.  The 909 circuits don't lend themselves to 
> > voltage control.  From what I know, I can control the parameters with a 
> > vactrol in series with the variable resistor.  If you have a better 
> > solution, I'm eager to hear it!
> >
> 
> You could try digital pots, maybe?  Does it *have* to be a control voltage?
> 
> -- 
> Gordonjcp MM0YEQ
> 
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