diff --git a/bumblebee/modules/pulseaudio.py b/bumblebee/modules/pulseaudio.py
index 2252b26..7578438 100644
--- a/bumblebee/modules/pulseaudio.py
+++ b/bumblebee/modules/pulseaudio.py
@@ -33,12 +33,17 @@ class Module(bumblebee.engine.Module):
         ]
 
         engine.input.register_callback(self, button=bumblebee.input.RIGHT_MOUSE, cmd="pavucontrol")
-        engine.input.register_callback(self, button=bumblebee.input.LEFT_MOUSE,
-            cmd="pactl set-{}-mute @DEFAULT_{}@ toggle".format(channel, channel.upper()))
-        engine.input.register_callback(self, button=bumblebee.input.WHEEL_UP,
-            cmd="pactl set-{}-volume @DEFAULT_{}@ +2%".format(channel, channel.upper()))
-        engine.input.register_callback(self, button=bumblebee.input.WHEEL_DOWN,
-            cmd="pactl set-{}-volume @DEFAULT_{}@ -2%".format(channel, channel.upper()))
+
+        events = [
+            { "type": "mute", "action": "toggle", "button": bumblebee.input.LEFT_MOUSE },
+            { "type": "volume", "action": "+2%", "button": bumblebee.input.WHEEL_UP },
+            { "type": "volume", "action": "-2%", "button": bumblebee.input.WHEEL_DOWN },
+        ]
+
+        for event in events:
+            engine.input.register_callback(self, button=event["button"],
+                cmd="pactl set-{}-{} @DEFAULT_{}@ {}".format(channel, event["type"],
+                    channel.upper(), event["action"]))
 
     def mute(self, value):
         self._mute = value