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apt install pulseaudio-module-lirc
sound : optional
lirc 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 the volume of a PulseAudio sink to be controlled when
buttons of an infrared remote control are pressed (through LIRC).
The module is called module-lirc.