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sound - How can I tell if I'm using alsa or pulse-audio by ...
https://askubuntu.com/questions/426983/how-can-i-tell-if-im-using-alsa-or-pulse-audio-by-default-switching-to-i3-wm#:~:text=Pulse%20Audio%20On%20top%20of%20the%20ALSA%20base,more%20for%20easy%20access%20from%20most%20Ubuntu%20applications.
10.10 - Why does Ubuntu use Pulseaudio? - Ask Ubuntu
https://askubuntu.com/questions/7816/why-does-ubuntu-use-pulseaudio
As to "why" they chose pulseaudio as the default, I don't know. It probably has to do with a lot of the same reason why they switched to Empathy as the default IM client. Those reasons (at least as far as I know) are related to the framework used in the backend. PulseAudio has a very good backend even if the implementation isn't 100% yet.
ubuntu - Why do you need PulseAudio? - Unix & Linux Stack ...
https://unix.stackexchange.com/questions/249342/why-do-you-need-pulseaudio
Then why do distros still enable the pulseaudio multiplexing daemon? It is laggy, buggy AF and has been the culprit behind too many sound problems! I disable the daemon rather than uninstalling the entire package, since there are dependencies with ALSA configuration, which the package does seem to do well.
Why Ubuntu uses PulseAudio « A better world
https://ossguy.com/?p=347
Since version 8.04, Ubuntu has used PulseAudio as its default sound system. After hearing of various problems people have had with PulseAudio (like this one and this one), one may wonder why Ubuntu uses PulseAudio at all, especially since these problems can often be fixed by turning off PulseAudio with no ill effects. The rationale for the switch to PulseAudio in …
PulseAudio - Ubuntu Wiki
https://wiki.ubuntu.com/PulseAudio
Because Lubuntu 16.04 does not use pulseaudio, it can be useful in determining whether an audio issue is caused by pulseaudio, the ALSA driver, or another program. If the issue still occurs in a Lubuntu environment, pulseaudio is probably not causing it. Note: Modern Lubuntu does use pulseaudio. Static, Underruns
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