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If you are only interested in relative results and not absolute values such as Volts and SPL (sound pressure level), you may skip this calibration part.
Some applications require calibration (for example to measure absolute values of sound pressure level, e.g. dBA) If your application requires calibration, please read this example that explains how to obtain calibrated SPL values, such as dBA. The easiest way of measuring dBA-level is to use an acoustic calibrator. Alternately, calibrated measurements can be performed if the sensitivity of your microphone is known.
Preparation: Calibrating the gain steps of your mixer
Combined input calibration example: Calibrating to measure absolute SPL
Individual calibration example: Measuring voltage using an adjustable attenuator
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