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There is an internal resistor between pins 1 and 8. If that resistor is in the circuit, the gain is 20. If that resistor is bypassed (AC short circuit) by a capacitor, the gain is 200. If you need to know how resistors can determine gain, you would have to understand feedback theory. If you don't know that the impedance of a capacitor goes down as frequency goes up, do a search for "capacitive reactance". If nothing makes sense, take it on faith and start studying.I just wanted to know how the gain pins, 1 and 8, work... how come a capacitor helps you to control said gain?