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apt install pulseaudio-module-x11
sound : optional
X11 module for PulseAudio sound server
PulseAudio, previously known as Polypaudio, is a sound server for POSIX and
WIN32 systems. It is a drop in replacement for the ESD sound server with
much better latency, mixing/re-sampling quality and overall architecture.
This module enables PulseAudio to publish itself as the default sound
server to the X11 root window automatically upon startup. There is also a
module to playback a sound file in place of the X11 bell beep.
The modules are called module-x11-publish and module-x11-bell.