Ideally, yes it is.  But (almost) all commonly used potentiometers that claim
"audio taper" actually use a piecewise linear approximation that is just
tolerably close to logarithmic over a few (maybe four) decades at best.
Looking at the published curves from Alps, Noble, Panasonic, etc.
visually suggests that only two segments are generally used.

The last time I actually saw a true, guaranteed logarithmic-taper pot was
back in the days of Allen-Bradley, and they charged a bundle for the things!

Brian Aase

> I thought audio taper WAS log taper.  The point is to have a fixed rotation
> angle of the pot change the loudness by a percieved fixed amount.  Since
> human sound perception is logarithmic, in the olde phashioned days before
> digital processing, volume control knobs had a logarithmic profile.  Maybe
> "audio" taper has some deviation from logarithmic at the high or low end
> (human perception is MOSTLY logarithmic), but even if that is the case, I
> expect there won't be a huge distinction for hobby projects.

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