[sdiy] Adding CV jacks to a synth...

[DTK]

Thanks Tim... you knew exactly the answers I was looking for, and I wasn't
even sure of the question...

> > What parameters on a synth can be controlled via CV?  That may be a
broad
> > question... Maybe it should be what sort of things generally can *not*
be
> > controlled via CV.
> >
> Well, it depends on the synth. Most analog synths out there will have
> voltage control of VCO frequency, VCO pulse width, VCF Frequency, and VCA
> amplitude. I mean, even if you look at something reasonably versatile like
> an Odyssey or a Mini Moog, those are the only voltage-controlled
parameters.
>
> Adding voltage control to other parameters usually means modifying or
> replacing some of the existing circuitry. Things like envelope times and
LFO
> rates are usually not voltage controlled in older analogs.
>

So are these things generally easy, or are they more involved projects?
Adding a CV jack seems easy enough (in my head anyway)... just insert an
input jack at the proper point.  Is there additional circuitry required
there as well?

One of the things I'm puzzling over -  the filter cutoff slider on my board
has a voltage range of -12v to 12v.  I'm thinking that simply inserting an
input on that circuit would cut out the bottom part of the range... it would
only work from 0v to 12v. Is that right, or have I totally missed the mark?

> Just some thoughts. Remember that 1) you may lower the value of some
> 'collectible' synths by extensively modifying them (this is usually not a
> big deal, especially if you don't intend to sell it) and 2) have fun with
> it!

*sell* something....  you're kidding, right?

Thanks...

D