Here's an interesting article about Potentiometers
http://www.elby-designs.com/documents/tailoringpotentionometers.pdf
You can DIY your own Audio {Log} pots starting from a linear pot of the same value using the 10% approximation. See section called "Tailoring Potentiometers"
Interesting nuances.....
5kA= 5kB + 470 ohms across wiper & outer lug