I started checking the PicocomA7 modul on the evaluation board for some basic tests.
One part was the audio output and input which failed due to a very low volume.
Using arecord and an external audio source seems to be ok.
Running aplay with a well known wave file shows nearly nothing on the output pins.
As it's the same audio codec like the PicocomA5 may be its the same issue like it was few years ago.