The guide by tangentsoft.net (under "Tweaks") says that
"In an op-amp circuit, the resistors in the feedback loop (R3 and R4 in this case) set the gain: the amount by which the output voltage is multiplied compared to the input voltage. The formula for gain in this amp is G = (R4/R3) + 1."
The build calls for a gain of 11, which I've heard is excessive, so I want to lower this to 5 or 6. There are two sets of R4 and R3 resistors - which do I change to affect the gain? Can I safely change one of the resistors in both sets if I'm not sure?