https://wiki.archlinux.org/title/WirePlumber#Keyboard_volume_control

wpctl set-volume -l 1.5 @DEFAULT_AUDIO_SINK@ 5%+

wpctl get-volume @DEFAULT_AUDIO_SINK@
wpctl set-volume @DEFAULT_AUDIO_SINK@ 5%+
wpctl set-volume @DEFAULT_AUDIO_SINK@ 5%-
mute/unmute the volume
wpctl set-mute @DEFAULT_AUDIO_SINK@ toggle

mute/unmite microphone
wpctl set-mute @DEFAULT_AUDIO_SOURCE@ toggle

???
https://kowalcj0.github.io/2022/01/09/handy-pipewire-commands-and-tools/
/etc/wireplumber/wireplumber.conf.d