Use symbolic pulseaudio devices in bindsym mappings

config/sway/config

@@ -155,10 +155,10 @@ input "type:touchpad" {
 bindsym --locked Xf86MonBrightnessDown exec brightnessctl set 5%-
 bindsym --locked Xf86MonBrightnessUp exec brightnessctl set 5%+
 
-bindsym --locked XF86AudioMicMute exec pactl set-source-mute 1 toggle
-bindsym --locked XF86AudioLowerVolume exec pactl set-sink-volume 0 -1000
-bindsym --locked XF86AudioRaiseVolume exec pactl set-sink-volume 0 +1000
-bindsym --locked XF86AudioMute exec pactl set-sink-mute 0 toggle
+bindsym --locked XF86AudioMicMute exec pactl set-source-mute @DEFAULT_SOURCE@ toggle
+bindsym --locked XF86AudioLowerVolume exec pactl set-sink-volume @DEFAULT_SINK@ -1000
+bindsym --locked XF86AudioRaiseVolume exec pactl set-sink-volume @DEFAULT_SINK@ +1000
+bindsym --locked XF86AudioMute exec pactl set-sink-mute @DEFAULT_SINK@ toggle
 
 bindsym Print exec grim -g "$(slurp)" - | swappy -f -
 bindsym $mod+Print exec grim - | swappy -f -