code: public boolean play (SoundType type, String pkgPath, String key, float pan)
      {
          return play(type, pkgPath, key, 0, pan);
      }
docs: Play the specified sound as the specified type of sound, immediately, with the specified
  pan value. Note that a sound need not be locked prior to playing.
  
  @param pan a value from -1f (all left) to +1f (all right).
  @return true if the sound actually played, or false if its sound type was disabled or if
  sound is off altogether.