Codec is index 1
so -Dplughw:1
arecord -h for options
Mic 3,4 is a good question also what ADC_KEY_IN1 is, is another good question, but not needed.
I2S_0 also works but also that loses the lines out as presume it now goes to the I2S output.
I am trying to work out if the VAD only works with I2S or PDM but haven’t a clue how to enable or use VAD so no bother.