Creating a background for a pond:

         DEF pondSoundXForm Transform {
           children                DEF pondSound Sound {
             source    DEF Sound1clip AudioClip {
                      url      "sounds/pond.aiff"
                      loop     TRUE
                      startTime        1
             }

             location  23.5 16.9 -36.5
             direction 0 0.9 0.1
             minFront  25
             maxFront  50
             minBack   25
             maxBack   50
           }

           translation -0.30 0 0.021
         }