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Mid-range pot. Use a 25K audio taper. Attach the 6.8K resister from the Bass pot to the middle lug of the midrange pot. Ground the other end to the casing. Run a lead from the Bass pot (where the resister had been located) to the left lug of the midrange pot (looking at the back with the lug pointed up). On zero or one, the tone is "stock." Anything above stock is adding midrange. It's a nice mod which gives you a nice bluesy crunch without giving up the stock tone.
Note: If you run the lead to the ground switch jack, you might need a shielded cable. Sometimes you might get a little feedback (not always) if you run the lead unshielded. If you put the midrange control in place of the second output jack, you typically don't need the shielded cable.
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