This is a commonly used and very simple circuit for a passive tone control as used in the Big Muff Pi guitar pedal.  I’ve tested it with a 10k logarithmic potentiometer and it would definitely work more effectively with the 100k linear potentiometer as indicated.

Here is a portion of the low power LM386 based guitar amp I am prototyping.  This is an audio buffer used for the input stage of the amplifier. Most people would use a simpler circuit built around a FET however I did not have any FET transistors within immediate reach so I did a whole bunch of fiddling around on my breadboard trying various other components I did have. This is what I found worked with the NPN audio transistors I was able...