code: public void setSourceRelative (boolean relative)
      {
          if (_sourceRelative != relative) {
              _sourceRelative = relative;
              AL10.alSourcei(_id, AL10.AL_SOURCE_RELATIVE, relative ? AL10.AL_TRUE : AL10.AL_FALSE);
          }
      }
docs: Sets whether or not the position, velocity, etc., of the source are relative to the
  listener.