Macbook Air and Openbox: Raise/Lower Volume, Up/Down Brightness

    <keybind key="XF86KbdBrightnessUp">
      <action name="Execute">
        <command>xbacklight +10</command>
      </action>
    </keybind>
    <keybind key="XF86KbdBrightnessDown">
      <action name="Execute">
        <command>xbacklight -10</command>
      </action>
    </keybind>
    <keybind key="XF86AudioRaiseVolume">
      <action name="Execute">
        <command>amixer -c 0 set Master 2dB+</command>
      </action>
    </keybind>
    <keybind key="XF86AudioLowerVolume">
      <action name="Execute">
        <command>amixer -c 0 set Master 2dB-</command>
      </action>
    </keybind>