SoListenerPositionElement(3) on Linux
The text 2fc9420e3012, as Debian 6.0 (Squeeze) shipped it.
The SoListenerPositionElement holds the position of the current listener. This position is set by SoListener nodes and SoCamera Nodes during audio rendering. When a SoListener is visited by the SoAudioRenderAction, it will add a new SoListenerPositionElement to the state, holding it's position and with the setbylistener flag set. When a SoCamera is visited by SoAudioRenderAction, it will add a new SoListenerPositionElement only if there are no previous elements with the setbylistener flag set.