Below is a tone control circuit commonly known as a Baxandall type. This works great for distortion pedals, as you can roll off highs and/or lows and leave the midrange alone. The values shown on the schematic work well in my opinion, but if you want to tweak it there is a great tool on the internet called Duncan's Tone Control Simulator located at:

http://www.duncanamps.com/tsc/index.html

This simulator allows you to change the value of any of the components and see how the frequency response of the circuit is affected. Very Cool!!

If the gif below is not clear, click HERE for a pdf version.

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