code: def convert_to_16bit(input_wav, output_wav):
      command = "sox {} -b 16 {}".format(input_wav, output_wav)
      subprocess.run(command, check=True)
  
imports: import argparse
  import glob
  import logging
  import os
  import re
  import shutil
  import subprocess
  import wave
  from typing import List, TextIO, Tuple
  import miditoolkit
  import numpy
  from local.pinyin_dict import PINYIN_DICT
  from tqdm import tqdm
  from espnet2.fileio.score_scp import SingingScoreWriter
label_desc: Use image node_id 6 for calling a global function with example usage: convert_to_16bit(input_wav, output_wav) without return types