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[OpenWrt Wiki] PulseAudio
https://openwrt.org/docs/guide-user/hardware/audio/pulseaudio
The thing is, hardware mixing is a thing of the past, modern soundcards don't do it anymore. Precisely for doing things like mixing in software SIMD CPU extensions like SSE have been invented. Modern sound cards these days are kind of “dumbed” down, high-quality DACs. They don't do mixing anymore, many modern chips don't even do volume ...
pulseaudio - Collecting and mixing sound input from ...
https://askubuntu.com/questions/868817/collecting-and-mixing-sound-input-from-different-microphones
I am able to play sound through two or more outputs/devices using paprefs and adding a virtual output device, as described in this answer: Play sound through two or more outputs/devices Now I would like to be able to do the same for the input, so basically to collect the sound input from any of the capable devices available and route it, for example, Skype or Slack.
Why you should care about PulseAudio (and how to start ...
https://www.linux.com/news/why-you-should-care-about-pulseaudio-and-how-start-doing-it/
Why you should care about PulseAudio (and how to start doing it) The audio system options in Linux can be a bit confusing. The projects (ALSA, OSS, ESD, aRts, JACK, and GStreamer, to name a few) all describe themselves in broad, similar terms, and the panoply of packages reads like a circular mix-and-match game — alsaplayer-esd, libesd-alsa, alsa-oss, …
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