Guess the LineOut is the same as Master(??).

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 :)

EDIT: strange, I tried the code from the initial post, which worked, but as written volume toggle isn't toggling but muting. Then I just copied your line for toggling (the 3rd last) over the other one and everything is cool now!:D

Thanks!

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

Then toggling mute works.

Not sure if this matters, but I think it has to be pasted under <keyboard> and before </keyboard> in your config file.

Thanks

Openbox menu > Preferences > Openbox Config > Edit rc.xml, save your changes then > Openbox menu > Preferences > Openbox Config > Reconfigure.

Is it possible for someone to explain how to determine what key "code" each keystroke performs?

I think you want:

sudo showkey

I have a 1005HA and it did not work for me either. I think that maybe the mute worked, however, volume up and down did not work.

Is it possible for someone to explain how to determine what key "code" each keystroke performs?

Marcus,

run "gnome-volume-control" and see if those volume levels are at the high level...

I copied and restarted, but no luck.  Also, whenever I turn on the comp, the sound starts at 0 volume.  Any ideas?

<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 PCM 0</execute>
      </action>
    </keybind>

toggle for some reason doesn't work for me, so my mute button just sets volume to 0.

i also added a volume bar to my conky:

${execibar 1 amixer sget PCM,0 |grep "Front Left:"|cut -d "[" -f2|cut -d "%" -f1}