diff --git a/bumblebee/modules/cpu.py b/bumblebee/modules/cpu.py
index cb7cd7f..e99ddd0 100644
--- a/bumblebee/modules/cpu.py
+++ b/bumblebee/modules/cpu.py
@@ -15,6 +15,9 @@ class Module(bumblebee.module.Module):
         super(Module, self).__init__(args)
         self._perc = psutil.cpu_percent(percpu=False)
 
+        output.add_callback(module=self.__module__, button=1,
+            cmd="gnome-system-monitor")
+
     def data(self):
         self._perc = psutil.cpu_percent(percpu=False)
 
diff --git a/bumblebee/modules/disk.py b/bumblebee/modules/disk.py
index eea8e8f..9e8ccf1 100644
--- a/bumblebee/modules/disk.py
+++ b/bumblebee/modules/disk.py
@@ -16,8 +16,8 @@ class Module(bumblebee.module.Module):
         super(Module, self).__init__(args)
         self._path = args[0] if args else "/"
 
-        output.add_callback(module=self.__module__,
-            button=1, cmd="nautilus {instance}")
+        output.add_callback(module=self.__module__, button=1,
+            cmd="nautilus {instance}")
 
     def data(self):
         st = os.statvfs(self._path)
diff --git a/bumblebee/modules/memory.py b/bumblebee/modules/memory.py
index b338211..e3d1bd2 100644
--- a/bumblebee/modules/memory.py
+++ b/bumblebee/modules/memory.py
@@ -16,6 +16,9 @@ class Module(bumblebee.module.Module):
         super(Module, self).__init__(args)
         self._mem = psutil.virtual_memory()
 
+        output.add_callback(module=self.__module__, button=1,
+            cmd="gnome-system-monitor")
+
     def data(self):
         self._mem = psutil.virtual_memory()
 
diff --git a/bumblebee/modules/pulseaudio.py b/bumblebee/modules/pulseaudio.py
index fe4e26a..6d3f13f 100644
--- a/bumblebee/modules/pulseaudio.py
+++ b/bumblebee/modules/pulseaudio.py
@@ -34,6 +34,16 @@ class Module(bumblebee.module.Module):
         self._right = 0
         self._mono = 0
         self._mute = False
+        channel = "sink" if self._module == "pasink" else "source"
+
+        output.add_callback(module=self.__module__, button=3,
+            cmd="pavucontrol")
+        output.add_callback(module=self.__module__, button=1,
+            cmd="pactl set-{}-mute @DEFAULT_{}@ toggle".format(channel, channel.upper()))
+        output.add_callback(module=self.__module__, button=4,
+            cmd="pactl set-{}-volume @DEFAULT_{}@ +2%".format(channel, channel.upper()))
+        output.add_callback(module=self.__module__, button=5,
+            cmd="pactl set-{}-volume @DEFAULT_{}@ -2%".format(channel, channel.upper()))
 
     def data(self):
         res = subprocess.check_output(shlex.split("pactl info"))