code: function cb_parse_buffer_as_wav_format(audio_obj, property_buffer_raw_input_file, property_buffer_input_file, cb_when_done) {
  
      // sync NOT async ... output into buffer_input_file
  
      parse_wav(audio_obj, property_buffer_raw_input_file, property_buffer_input_file);
  
      delete audio_obj[property_buffer_raw_input_file];    // no longer need raw pre parse buffer
  
      // console.log("buffer size ", audio_obj[property_buffer_input_file].length);
  
      audio_obj.buffer = shared_utils.convert_16_bit_signed_int_to_32_bit_float(audio_obj[property_buffer_input_file]);
  
      delete audio_obj[property_buffer_input_file];    // no longer need raw pre parse buffer
  
      cb_when_done(audio_obj);  //  this is defined by original caller to hand back audio object with populated buffer
  
  }
docs: ---