@ christophe60_fr
@ anybody_else_for_that_matter
In addition to all this you may want to have a look at
this thread and its latest posts (basically from # 23 onwards). I'm running on ALSA only for audio and it works perfectly fine with a cleaner approach. You actually don't need anything else but ALSA itself. For me this includes:
extra/alsa-lib
extra/plugins
extra/alsa-utils
community/alsa-tools
To have a tray icon for volume:
aur/alsa-tray
You may have to set your sound card once if ALSA doesn't switch to it by default. Don't hesitate to ask for help on this (fungal and I mention this in the above thread).