 arrive while audio is being processed and represent the current "best guess" about
            // what's been spoken so far.
            recognizer.recognizing = onRecognizing;

            // The 'recognized' event signals that a finalized recognition result has been received. These results are
            // formed across complete utterance audio (with either silence or eof at the end) and will include
            // punctuation, capitalization, and potentially other extra details.
            // 
      