If jack audio device connected to front panel: automatically switch to stereo headphones fp, if device removed, alsamixer changed to stereo headphones.
Script worked and tested on Manjaro KDE, KDE Neon, Fedora 39.
download repository as ZIP and unpack
sudo mkdir /opt/dgx_auto_switcher
sudo cd {path_to}/Asus-Xonar-DG-AutoSwitcher-main
sudo chmod +x main.py
sudo cp * /opt/dgx_auto_switcher/
sudo ln -s /opt/dgx_auto_switcher/dgx_auto_switcher.service /etc/systemd/system/dgx_auto_switcher.service
systemctl daemon-reload
systemctl start dgx_auto_switcher
systemctl enable dgx_auto_switcher
systemctl disable dgx_auto_switcher
systemctl restart dgx_auto_switcher
systemctl stop dgx_auto_switcher
systemctl status dgx_auto_switcher