Active Tone Control Hum and Buzz in Potentiometer
This is not a sensible approach for a buffer amplifier: -



The pot's wiper directly connects to the virtual earth point of the inverting amplifier and this is asking for noise problems. At the very least you need to insert a resistor in line with the wiper of the pot.

A better method is to have the wiper feeding the non-inverting terminal of the op-amp and having a feedback resistor and grounding resistor like this: -