We have noticed that the sound output can be clipped on the m3 board.

This only happens with the ak4613 card, the output on an USB sound card is always fine.

The issue might be related to process resource limitations with systemd, since launching the process on cmdline makes the problem not happen.

Furthermore, removing that line :

SmackProcessLabel=User::App::agl-service-audio-4a

from the service file makes the sound fine.