The cap change will allow more bass through but will not affect the circuit gain. To do that, you'll need to lower the value of resistor R7 on the labeled PCB diagram below. But know that when you do that, it will also affect the bass rolloff frequency of the pedal. So you have to know how much to raise the value of that C4 cap to get the bass rolloff where you want it to be when you lower the R7 value for more gain. I would suggest reducing R7 to 1K and increasing C4 to 470n--that will give you ~5x as much maximum gain (that's not as big of a change to your ear as the 5x value would suggest) while dropping the bass rolloff frequency from 720Hz to 339Hz. I find that to be a nice compromise of gain and bass for the circuit, though "YMMV."
As far as the other resistor (R6) goes, that one controls the
minimum gain of the pedal, and is also affected by the value of R7. To keep the minimum gain the same as the stock pedal, drop R6 to 10K if R7 goes to 1K. If you want it even cleaner at minimum gain setting, drop it to a 1K. At that point, it's basically an op amp boost with the drive pot all the way down.
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