Psuedo-Log-Taper Pots

[R.G. Keen]

>I seem to remember hearing something about a trick which can be done to get a
>pseudo-log-taper response out of a linear potentiometer.  I think it was done
>by adding a resistor or two in parallel with the pot.  Has anybody ever tried
>this?  Exactly how should it be wired, and how should the resistor values be
>selected?  My applications for this:  one would be a three-terminal
>attentuator (for audio), and the other would be using the pot as a two-
>terminal variable resistor (such as the speed/freq. control in a typical two-
>opamp square/triangle LFO circuit).
>
>I imagine that if this trick works, it could also be used to affect a psudo-
>reverse-log-taper response, just by wiring it backwards, no?

It works for voltage divider, three terminal pot usage only. You can make a 
psuedo log or psuedo reverse log pot out of a linear if you want to use it 
like a volume control. The primo use here is to make a log/antilog pot from 
a dual linear for a pan control (although there are better ways to make a 
pan).

However, the use everyone wants reverse log pots for is for a speed control 
for LFO's. This almost invariably means wiring the pot as two terminal 
variable resistor. The paralleled resistance trick does NOT work in this 
instance. No pony here.