Sony Spresense: Audio Extraction with 4 mics connected

Hi, I'm trying to extract the audio using 4 analog mics. But I don't know how I can select different channels while recording. For example while all 4 microphones connected, I only want to record with the microphone connect to channel C.

Actually it is very easy for a few dollars you can get a microphone mixer from your favorite music store probably for less then you could build it.

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