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apt install pulseaudio-module-jack
sound : optional
jackd modules 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.
These modules enables PulseAudio to connect to a jackd daemon.
The modules are called module-jack-sink, module-jack-source.