Replace the tone stack caps as shown in the pic.

A very popular mod on vintage Fenders is to replace the bass and mid caps on the vintage channel( C8 and C9) with .022 caps. We've included those caps if you want to try it. It'll make the amp a little smoother and the lows less woofy

If you want to modify the Custom Channel back to Deluxe Reveb specs you need to remove the 18k resistor on the back of the board and solder a lead in it's place as shown in the pic and also install a .047 cap in C4 instead of the stock .022