Decware Zkit4 potentiometer placement

Where would a pot be placed in this circuit to control the gain. I have read in various places that a 100k pot can be used on the output side. Would it just replace the 100k resistor or be added in addition to the existing 100k resistor on the output? Or somewhere else?
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The pot should be at the input, not at the output (which is bad for distortion and high frequencies).
Signal goes to the top terminal of the pot, and the pot wiper goes to the input capacitor.
 
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