I hope somebody with more knowledge then I posts, but I believe an input pad is a just a pull down resistor that sends some of the signal to ground. Changing that resistor value (or replacing with a pot) should work.
Depends on the way it's built. You can attenuate the signal either with a voltage divider (2 resistors) or just with one resistor in the signal path or a very low tuned low-pass or a very high tuned high pass filter or a combination of both.
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DIY Effect Makers #20
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Originally Posted by JTE
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