[sdiy] filtering cv

[bdu at fdiskc.com]

>
> Cynthia Webster wrote (about adding an AC/DC coupling switch:
>
> "Try adding this very same feature to the inputs of a ring modulator -
> Very Handy!"
>
> Absolutely right on, Cynthia!  Ring modulators (four quadrant multipliers)
> are a great way to process CV's, if they're DC coupled.

And for an example of a Ringmod with an AC/DC switch, see the Arp2600...

-Brandon