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I noticed that there's no channel called Master when I tried this fix. Here's the code I pasted into rc.xml

Super+space -> Preferences -> Openbox Config -> Edit rc.xml

Place the marker at the end of the last </keybind> (Right above the </Keyboard> line). Hit Enter and paste the code:

<keybind key="XF86AudioLowerVolume">
      <action name="Execute">
      <execute>amixer -q set PCM 10- unmute</execute>
      </action>
    </keybind>
    <keybind key="XF86AudioRaiseVolume">
      <action name="Execute">
      <execute>amixer -q set PCM 10+ unmute</execute>
      </action>
    </keybind>
    <keybind key="XF86AudioMute">
      <action name="Execute">
      <execute>amixer -q set LineOut toggle</execute>
      </action>
    </keybind>

Save and close.

Super+space -> Preferences -> Openbox Config -> Restart.

The VolWheel in the system tray didn't work eighter, so I right-clicked the "Volume Icon" -> Preferences -> Default channel: PCM
Default mixer: gnome-volume-control

Super+v to set the preferred level for the LineOut channel with PCM channel maxed out. WARNING!: Be careful when you start adjusting the LineOut.. better start out at a fairly low volume setting when the PCM is at 100%.
When you have found your preferred max volume setting you are good to go