MAXIM : Use a Linear Potentiometer to Create a Nonlinear Transfer Function

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Use a Linear Potentiometer to Create a Nonlinear Transfer Function for Audio Volume Control
Maxim > Design Support > Technical Documents > App Notes > APP 838

Abstract: Linear digital potentiometers (pots) can be used in nonlinear applications, such as adjusting volume control in audio applications.
This article discusses how to create a "pseudologarithmic" taper digital potentiometer (pot). This is achieved by simply adding a single
resistor to the end of the digital pot when configured as a variable resistor.

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