I updated the firmware of my to most recent version.
I connected a capacitive mic to mic pins of the card.
When I execute the below commands:
arecord --format=S16_LE --channels=1 --rate=44100 micro.wav --duration=10
all I hear is a white noise.
I've tried with various levels of MIC1 and MIC2 input and boost levels. ( of course the level of noise decreases when I decrease MIC2 level and MIC2 boost level)
I have tried with several microphones.
Any suggestions are welcome.