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The microphone input MIC1 is transmitted to the inverting amplifier through C3 and R4; the gain of U2-a is controlled by R5. The output of U2-a is transmitted through C4 to the remaining op amps (U2-b, U2-c, U2-d), where they are configured as bandpass filters. Using a combination of resistors/capacitors, each filter is tunable to pass a different frequency range.