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alsa

command line tools

alsa
alsactl
amixer
aplay

find sound cards

cat /proc/asound/cards

list devices in more detail

aplay -l

specify alsa default device in /etc/asound.conf

defaults.pcm.card 1
defaults.ctl.card 1

apply changes to alsa config

sudo alsa reload

documentation

https://wiki.archlinux.org/index.php/Advanced_Linux_Sound_Architecture#Set_the_default_sound_card