Re: where use all three terminals on a potentiometer?

layoutdesign wrote:
I have used two of the three terminals to vary the resistance for
controling the gain or amplification for audio.

This describes the simplest example of a "pad". It is VERY dependent
on the impedances of *other* elements in the circuit.
(With a "pot", you want that other stuff to be "swamped out".)

....and if you're only using 2 terminals, you're using the wrong term:
http://www.google.com/search?q=A.rheostat.is.a.two-terminal.variable.resistor

Here is the fundamental concept of a potentiometer
(without the fancy name).
http://www.google.com/search?q=cache:L_MdVwVuYzoJ:en.wikipedia.org/wiki/Voltage_divider+gnu+potentiometer&strip=1
.

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