* pulseaudio-alsa, in addition to install PulseAudio as a dependency,
configures ALSA to use PulseAudio.
* PulseAudio started by the systemd --user instance.
* Drop-ins allow PulseAudio start as root.
* XFCE panel configuration adjusted accordingly.
* alsa-utils is optional, but still useful for debugging purposes.
* 90-alsa-restore.rules is not useful with PulseAudio, mask it.