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How to connect four analog microphones to Raspberry Pi GPIO?

The Pi has no analogue GPIO. You need additional circuitry between the Pi's digital GPIO and the microphones. The simplest way would be to add a SPI based ADC such as the MCP3008.
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ServoMotor I2C module

You need to find or write Java code to drive that I2C servo module. It is based on the PCA9685 PWM chip. If you search for its datasheet it will show the I2C commands to use. If you need to write ...
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