I'm using an EVAL-ADAU1X61EBZ Board with one(!) digital Mic ADPM521 on a Flex board. When plugging this mic onto the header J4 the signal is routed to both DSP Core inputs 0 and 1 although I can't find any mixing or input routing settings which I can blame for. It makes no difference if I choose L or R input (L/R Sel Hi/Lo). I also tried this ADAU1761_DigitalMicInToDAC.dspproj which I found somewhere here.
When disabling left or right ADC, I still hear the input on the opposite ear (e.g. mic on input L, left ADC disabled => still hearable on right ear).
Does it work as expected only when using two mics?