[sdiy] vactrol end resistance

[JH.]

> Another problem...  Potentiometers have a very low 'end' resistance...
they
> go essentially to zero ohms.  Vactrols will never make it under maybe 100
ohms...
> more like 500 ohms to 1K ohms for common units.

Yes, but when you build a potentiometer from two vactrols, the _other_ side
can get very high impedance, so you get excellent attenuation even with an
on-resistance of several hundred ohms!

That's what I meant with the "vactrol pot" changing its end-to-end
resistance.
If you design that behaviour into your circuit (basically, that means no
heavy loading of the vactrol-pot), you can turn it into a feature.

JH.