Install the sndio package and enable the sndiod(8) service.

# xbps-install -S sndio
# ln -s /etc/sv/sndiod /var/service/


The service can be configured by adding sndiod(8) flags to the OPTS variable in the service configuration file (/etc/sv/sndiod/conf).

Default device

sndiod(8) uses the first alsa device by default. To use another alsa device for sndios default device snd/0 add the flags to use use specific devices to the service configuration file.

# echo 'OPTS="-f rsnd/Speaker"' >/etc/sv/sndiod/conf

Use the -f flag to chooses a device by its alsa device index or its alsa device name.

Volume control

The master and per application volume controls are controlled with MIDI messages by hardware or software.

aucatctl(1) is a tool specific to sndio to send MIDI control messages to the sndiod(8) daemon.

# xbps-install -S aucatctl

Application specific configurations


Firefox is build with sndio support, but to use it its required to set the following about:config options to use it.


To have firefox and other applications use sndio simultaneously you also have to whitelist the sndio cookie file with the following about:config options.



Mpv comes with sndio support, but to avoid it from using alsa over sndio if the device is available set the --ao=sndio command line option or add the option to mpvs configuration file.

$ echo 'ao=sndio' >> ~/.config/mpv/mpv.conf