n);
          source.start();

          const listener = context.listener;

        // Set listener properties to "random" values so that motion on one of
        // the attributes actually changes things relative to the panner
        // location.  And the up and forward directions should have a simple
        // relationship between them.
          listener.positionX.value = -1;
          listener.positionY.value = 1;
          listener.positionZ.value = -1;
          listener.forwardX.value = -1;
      