~# lsmod |grep -i snd
snd_hda_codec_analog    24576  1
snd_hda_codec_generic   122880  1 snd_hda_codec_analog
ledtrig_audio          12288  1 snd_hda_codec_generic
snd_hda_codec_hdmi     94208  1
snd_hda_intel          61440  5
snd_intel_dspcfg       32768  1 snd_hda_intel
snd_intel_sdw_acpi     16384  1 snd_intel_dspcfg
snd_hda_codec         212992  4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_analog
snd_hda_core          147456  5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_analog,snd_hda_codec
snd_hwdep              20480  1 snd_hda_codec
snd_pcm               196608  5 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_core
snd_seq_midi           24576  0
snd_seq_midi_event     16384  1 snd_seq_midi
snd_rawmidi            57344  1 snd_seq_midi
snd_seq               118784  2 snd_seq_midi,snd_seq_midi_event
snd_seq_device         16384  3 snd_seq,snd_seq_midi,snd_rawmidi
snd_timer              49152  2 snd_seq,snd_pcm
snd                   143360  20 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec_analog,snd_hda_codec,snd_timer,snd_pcm,snd_rawmidi
soundcore              16384  1 snd

~# inxi -Fxz |grep -i -A1 audio
Audio:
Device-1: Intel 82801I HD Audio vendor: Dell Optiplex 755 driver: snd_hda_intel v: kernel
bus-ID: 00:1b.0
Device-2: AMD Caicos HDMI Audio [Radeon HD 6450 / 7450/8450/8490 OEM R5 230/235/235X OEM]
vendor: PC Partner driver: snd_hda_intel v: kernel bus-ID: 01:00.1
--
Sound Server-2: PulseAudio v: 15.99.1 running: yes
Sound Server-3: PipeWire v: 0.3.48 running: yes

$ ps -aux |grep -i pulse
kszwaba     2395  0.1  0.3 1149660 23164 ?       Ssl  00:45   1:03 /usr/bin/pulseaudio --daemonize=no --log-target=journal

$ dpkg -l |grep -i pulse
ii  gstreamer1.0-pulseaudio:amd64              1.20.3-0ubuntu1.1                           amd64        GStreamer plugin for PulseAudio (transitional package)
ii  libp8-platform2:amd64                      2.1.0.1+dfsg1-3build1                       amd64        Pulse-Eight's platform support library
ii  libpulse-mainloop-glib0:amd64              1:15.99.1+dfsg1-1ubuntu2.1                  amd64        PulseAudio client libraries (glib support)
ii  libpulse0:amd64                            1:15.99.1+dfsg1-1ubuntu2.1                  amd64        PulseAudio client libraries
ii  libpulse0:i386                             1:15.99.1+dfsg1-1ubuntu2.1                  i386         PulseAudio client libraries
ii  libpulsedsp:amd64                          1:15.99.1+dfsg1-1ubuntu2.1                  amd64        PulseAudio OSS pre-load library
ii  pavucontrol                                5.0-2                                       amd64        PulseAudio Volume Control
ii  pulseaudio                                 1:15.99.1+dfsg1-1ubuntu2.1                  amd64        PulseAudio sound server
ii  pulseaudio-utils                           1:15.99.1+dfsg1-1ubuntu2.1                  amd64        Command line tools for the PulseAudio sound server

dpkg -l |grep -i alsa
ii  alsa-base                                  1.0.25+dfsg-0ubuntu7                        all          ALSA driver configuration files
ii  alsa-oss                                   1.1.8-1                                     amd64        ALSA wrapper for OSS applications
ii  alsa-topology-conf                         1.2.5.1-2                                   all          ALSA topology configuration files
ii  alsa-ucm-conf                              1.2.6.3-1ubuntu1.10                         all          ALSA Use Case Manager configuration files
ii  alsa-utils                                 1.2.6-1ubuntu1                              amd64        Utilities for configuring and using ALSA
ii  alsaplayer-alsa                            0.99.81-2build3                             amd64        alsaplayer output module for ALSA
ii  alsaplayer-common                          0.99.81-2build3                             amd64        audio player (common files)
ii  alsaplayer-gtk                             0.99.81-2build3                             amd64        alsaplayer gtk interface
ii  gstreamer1.0-alsa:amd64                    1.20.1-1ubuntu0.1                           amd64        GStreamer plugin for ALSA
ii  libasound2:amd64                           1.2.6.1-1ubuntu1                            amd64        shared library for ALSA applications
ii  libasound2:i386                            1.2.6.1-1ubuntu1                            i386         shared library for ALSA applications
ii  libasound2-data                            1.2.6.1-1ubuntu1                            all          Configuration files and profiles for ALSA drivers
ii  libasound2-plugins:amd64                   1.2.6-1                                     amd64        ALSA library additional plugins
ii  libasound2-plugins:i386                    1.2.6-1                                     i386         ALSA library additional plugins
ii  libatopology2:amd64                        1.2.6.1-1ubuntu1                            amd64        shared library for handling ALSA topology definitions
ii  linux-sound-base                           1.0.25+dfsg-0ubuntu7                        all          base package for ALSA and OSS sound systems

pactl info
Server String: /run/user/1000/pulse/native
Library Protocol Version: 35
Server Protocol Version: 35
Is Local: yes
Client Index: 159
Tile Size: 65472
User Name: kszwaba
Host Name: pc1295szwaba-04
Server Name: pulseaudio
Server Version: 15.99.1
Default Sample Specification: s16le 2ch 44100Hz
Default Channel Map: front-left,front-right
Default Sink: alsa_output.pci-0000_00_1b.0.analog-stereo
Default Source: nx_remapped_out
Cookie: 1d81:aea3

$ ls -l /run/user/1000/pulse/
total 4
srwxrwxrwx 1 kszwaba kszwaba 0 Feb 17 00:46 cli
srw-rw-rw- 1 kszwaba kszwaba 0 Feb 17 00:45 native
-rw------- 1 kszwaba kszwaba 5 Feb 17 00:45 pid

$ cat /usr/NX/etc/node.cfg |grep -i audio

AudioInterface pulseaudio
CommandStartPulseAudio "/usr/bin/pulseaudio --high-priority=no"
EnableAudio 1

$ /usr/bin/pulseaudio --high-priority=no --dump-conf
### Read from configuration file: /etc/pulse/daemon.conf ###
daemonize = no
fail = yes
high-priority = no
nice-level = -11
realtime-scheduling = yes
realtime-priority = 5
allow-module-loading = yes
allow-exit = yes
use-pid-file = yes
system-instance = no
local-server-type = user
cpu-limit = no
enable-shm = yes
flat-volumes = no
rescue-streams = yes
lock-memory = no
exit-idle-time = 20
scache-idle-time = 20
dl-search-path = /usr/lib/pulse-15.99.1+dfsg1/modules
default-script-file = /etc/pulse/default.pa
load-default-script-file = yes
log-target =
log-level = notice
resample-method = auto
avoid-resampling = no
enable-remixing = yes
remixing-use-all-sink-channels = yes
remixing-produce-lfe = no
remixing-consume-lfe = no
lfe-crossover-freq = 0
default-sample-format = s16le
default-sample-rate = 44100
alternate-sample-rate = 48000
default-sample-channels = 2
default-channel-map = front-left,front-right
default-fragments = 4
default-fragment-size-msec = 25
enable-deferred-volume = yes
deferred-volume-safety-margin-usec = 1
deferred-volume-extra-delay-usec = 0
shm-size-bytes = 0
log-meta = no
log-time = no
log-backtrace = 0
rlimit-fsize = -1
rlimit-data = -1
rlimit-stack = -1
rlimit-core = -1
rlimit-rss = -1
rlimit-as = -1
rlimit-nproc = -1
rlimit-nofile = 256
rlimit-memlock = -1
rlimit-locks = -1
rlimit-sigpending = -1
rlimit-msgqueue = -1
rlimit-nice = 31
rlimit-rtprio = 9
rlimit-rttime = 200000

$ grep -v '^#' /usr/NX/share/audio/default.pa | grep .
.fail
load-module module-device-restore
load-module module-stream-restore
load-module module-card-restore
load-module module-augment-properties
load-module module-switch-on-port-available
.ifexists module-switch-on-connect.so
load-module module-switch-on-connect
.endif
.ifexists module-jackdbus-detect.so
.nofail
load-module module-jackdbus-detect channels=2
.fail
.endif
.ifexists module-bluetooth-policy.so
load-module module-bluetooth-policy
.endif
.ifexists module-bluetooth-discover.so
load-module module-bluetooth-discover
.endif
.ifexists module-gsettings.so
.nofail
load-module module-gsettings
.fail
.endif
load-module module-default-device-restore
load-module module-always-sink
load-module module-intended-roles
load-module module-suspend-on-idle
.ifexists module-console-kit.so
load-module module-console-kit
.endif
.ifexists module-systemd-login.so
load-module module-systemd-login
.endif
load-module module-position-event-sounds
load-module module-role-cork
.ifexists module-snap-policy.so
load-module module-snap-policy
.endif
load-module module-filter-heuristics
load-module module-filter-apply
.ifexists module-x11-publish.so
.nofail
load-module module-x11-publish
.fail
.endif

$ pactl list sources
Source #0
State: RUNNING
Name: alsa_output.pci-0000_00_1b.0.analog-stereo.monitor
Description: Monitor of Wbudowany dźwięk Analogowe stereo
Driver: module-alsa-card.c
Sample Specification: s16le 2ch 44100Hz
Channel Map: front-left,front-right
Owner Module: 8
Mute: no
Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
balance 0.00
Base Volume: 65536 / 100% / 0.00 dB
Monitor of Sink: alsa_output.pci-0000_00_1b.0.analog-stereo
Latency: 0 usec, configured 40000 usec
Flags: DECIBEL_VOLUME LATENCY
Properties:
device.description = "Monitor of Wbudowany dźwięk Analogowe stereo"
device.class = "monitor"
alsa.card = "0"
alsa.card_name = "HDA Intel"
alsa.long_card_name = "HDA Intel at 0xfebdc000 irq 28"
alsa.driver_name = "snd_hda_intel"
device.bus_path = "pci-0000:00:1b.0"
sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card0"
device.bus = "pci"
device.vendor.id = "8086"
device.vendor.name = "Intel Corporation"
device.product.id = "293e"
device.product.name = "82801I (ICH9 Family) HD Audio Controller (Optiplex 755)"
device.form_factor = "internal"
device.string = "0"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-pci"
Formats:
pcm

Source #15
State: RUNNING
Name: nx_voice_out.monitor
Description: Monitor of NoMachine Output
Driver: module-null-sink.c
Sample Specification: s16le 2ch 44100Hz
Channel Map: front-left,front-right
Owner Module: 54
Mute: no
Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
balance 0.00
Base Volume: 65536 / 100% / 0.00 dB
Monitor of Sink: nx_voice_out
Latency: 0 usec, configured 40000 usec
Flags: DECIBEL_VOLUME LATENCY
Properties:
device.description = "Monitor of NoMachine Output"
device.class = "monitor"
device.icon_name = "audio-input-microphone"
Formats:
pcm

Source #16
State: RUNNING
Name: nx_remapped_out
Description: NoMachine Microphone
Driver: module-remap-source.c
Sample Specification: s16le 2ch 44100Hz
Channel Map: mono,mono
Owner Module: 55
Mute: no
Volume: mono: 68094 / 104% / 1.00 dB,   mono: 68094 / 104% / 1.00 dB
balance 0.00