Use pactl_helper for i3 keybindings.

bin/pactl_helper

@@ -26,8 +26,17 @@ function mute {
   pactl set-sink-mute $(get_default_sink) ${MODE}
 }
 
+function volume {
+  VOL="${1}"
+  if test -z "${VOL}" ; then
+    echo "Need volume spec!"
+    exit 1
+  fi
+  pactl set-sink-volume $(get_default_sink) "${VOL}"
+}
+
 case "$1" in
-  mute|micmute)
+  mute|micmute|volume)
     $*
     ;;
   *)