#enabling sound on rpi 3
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Install software $ sudo pacman -S alsa-firmware alsa-lib alsa-plugins alsa-utils
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Turn sound device on $ sudo modprobe snd-bcm2835
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create /etc/modules-load.d/snd-bcm2835.conf $ sudo echo "snd-bcm2835" >> /etc/modules-load.d/snd-bcm2835.conf
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unmute and adjust volume with alsamixer (mine is already unmuted at this point) $ sudo alsamixer
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test sound $ speaker-test -c 2
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save adjustments $ sudo alsactl store