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[pulseaudio-discuss] Can't get pulseaudio to use alsa/dmix?
https://pulseaudio-discuss.freedesktop.narkive.com/Eawt1Iao/can-t-get-pulseaudio-to-use-alsa-dmix
dmix has the same kind of effect within the ALSA library, but PulseAudio gives you more flexibility, and someone else said that in his experience it runs faster and gives less latency. PulseAudio provides an ALSA plugin, so you can do, for example, (with the right stanza in .asoundrc) aplay -D pulse song.wav
What is the relation between ALSA and PulseAudio sound ...
https://askubuntu.com/questions/581128/what-is-the-relation-between-alsa-and-pulseaudio-sound-architecture
The dmix plugin has been integrated with alsa and enabled by default since version 1.0.9 released in 2005. From any real metric, it is part of alsa by itself. It is simply misleading to imply alsa doesn't do what it has done successfully BY DEFAULT for over 16 years at this point.
[SOLVED] Alsa - problem with mixing (dmix) multiple audio ...
https://bbs.archlinux.org/viewtopic.php?id=229286
Either you still have some ALSA config somewhere or your Pulseaudio is misconfigured. No other way ALSA would try a non-existent device by default. Pulseaudio =/= dmix. I'm trying to run as lean a system as I can. After a fresh install in 2015 dmix did not work - thus the .asoundrc. With it ALSA does everything I want without PA even installed.
Alsa dmix high cpu usage | Linux.org
https://www.linux.org/threads/alsa-dmix-high-cpu-usage.22918/
There's a chance that a part of alsa sound treatment happens in userland. So if any alsa plugin (such as softvol or dmix) takes some CPU power (which they do) it will impact the process that uses alsa (your players). Dmix and Softvol are software plugins. They have to recompute audio frames to combine them and to change the volume.
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