AudioClip { 
      exposedField   SFString description      ""
      exposedField   SFBool   loop             FALSE
      exposedField   SFFloat  pitch            1.0        # (0,)
      exposedField   SFTime   startTime        0          # (-,)
      exposedField   SFTime   stopTime         0          # (-,)
      exposedField   MFString url              []
      eventOut       SFTime   duration_changed
      eventOut       SFBool   isActive
    }