See also: DESKTOP Configuring Keybindings
By default, Lenovo and IBM Thinkpad laptop volume controls do nothing in Openbox. Add the following code into the KEYBOARD section of the Openbox rc.xml file:
<!-- audio -->
<keybind key="XF86AudioRaiseVolume">
<action name="Execute">
<command>amixer set Master 5%+</command>
</action>
</keybind>
<keybind key="XF86AudioLowerVolume">
<action name="Execute">
<command>amixer set Master 5%-</command>
</action>
</keybind>
<keybind key="XF86AudioMute">
<action name="Execute">
<command>amixer set Master toggle</command>
</action>
</keybind>