> I think I understand where you are coming from, however - it would be
> a custom job to get a pot that reacted in log fashion for half its
> travel, and in reverse log fashion for the other half, no?
Unity gain buffer amp drives cw end of pot. Inverting amp drives
ccw end. Middle connection of pot is output, and loaded to GND
by a smaller resistor. For 100k pot, 30k load. Not truely exponential,
but better than linear.
You can also load the pot with two identical resistors to both ends.
This works in that other Reversible Attenuator configuration (with
the pot at the input of a differential amp).
JH.