Keep in mind that the cap only comes into play when the tone control is turned down. Otherwise it’s the resistance of the pot affecting the tone.
What type of tone do you want with the control turned down? If you want mud use a larger value like .047uF. If you just want to remove the top end while leaving the mids intact then use something like .01uF.
Also the hotter the pickups the greater the resonance in the circuit.
Just try some caps out. There’s no right or wrong formula.
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