[sdiy] CV-vactrol circuit

[Gordonjcp]

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