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What is the relation between ALSA and PulseAudio sound ...
https://askubuntu.com/questions/581128/what-is-the-relation-between-alsa-and-pulseaudio-sound-architecture
As far as I know, ALSA is a package of many sound card drivers, and PulseAudio is a audio application that operate the sound data like mixing or equalizer. But why there is a control bar called PCM in the panel of alsamixer. Does that actually change volume by controlling the chip on the sound card? If not, why it isn't PulseAudio'a job?
linux - How do ALSA and PulseAudio relate? - Super User
https://superuser.com/questions/144648/how-do-alsa-and-pulseaudio-relate
ALSA is the kernel level sound mixer, it manages your sound card directly. ALSA by itself can only handle one application at a time. Of course, there is 'dmix', which was written to solve this problem. (It's an ALSA module.) PulseAudio is a software mixer, on top of the userland (like you'd run an app).
PulseAudio/Examples - ArchWiki
https://wiki.archlinux.org/title/PulseAudio/Examples
Also make sure pulseaudio-alsa is not installed so standard ALSA clients do not default to pulse. Since pulseaudio-alsa contains only a configuration file /etc/asound.conf, if it is installed as dependency, one could simply comment all contents in /etc/asound.conf. alsamixer functions properly as well as any other ALSA clients. Also make sure common frameworks like Xine, …
Noob’s Guide to Linux Audio: ALSA, OSS, and Pulse Audio ...
https://linuxhint.com/guide_linux_audio/
The job of PulseAudio is to pass sound data between your applications and your hardware, directing sounds coming from ALSA to various output destinations, such as your computer speakers or headphones.
Audio Troubleshooting - System76 Support
https://support.system76.com/articles/audio/
The program PulseAudio Volume Control is helpful in figuring out which program is producing audio, where that audio is being routed, what the default input/output devices are, and what the volume levels are set to. It can be installed using the Pop!_Shop, or with this command: sudo apt install pavucontrol.
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