Configuring Raspbian OS for the Pi2AES Hats

 The card is said to use the same drivers as the HiFiBerry Digi+ Pro. So following this page, we need to:

1. Remove the line
   dtparam=audio=on
   from /boot/config.txt if it exists (which it probably does).
   
2. If your system uses the vc4-fkms-v3d overlay, make sure, audio is also disabled on this:
   dtoverlay=vc4fkms-v3d,audio=off
   I had something similar, so set that to off.
3. Assign the right card to squeezelite. Use squeezelite -l to get a listing. You probably want hw:CARD=sndrpihifiberry,DEV=0. So open /etc/defaults/squeezelite, and add that as the card.

That's it!