MOTM

> Couldn't one just run the keyboard voltage through an attenuator and have
a
> bypass switch for the straight keyboard voltage?

Yes.

And if you want a *really* cheap and dirty solution (I don't recommend
it, but sometimes quick and dirty is fine though it's clearly sub standard
...),
solder a cable with a 100k series resistor at one end (for 1/2 tracking).
Just make sure that the resistor end of the cable goes at the input of the
VCF,
not the output of the keyboard. Depending on your mechanical skill, you
can also solder a switch across this resistor.

JH.