code: def _get_valid_formats():
      ''' Calls SoX help for a lists of audio formats available with the current
      install of SoX.
  
      Returns:
      --------
      formats : list
          List of audio file extensions that SoX can process.
  
      '''
      if NO_SOX:
          return []
  
      so = subprocess.check_output(['sox', '-h'])
      if type(so) is not str:
          so = str(so, encoding='UTF-8')
      so = so.split('\n')
      idx = [i for i in range(len(so)) if 'AUDIO FILE FORMATS:' in so[i]][0]
      formats = so[idx].split(' ')[3:]
  
      return formatf _get_valid_formats():
      ''' Calls SoX help for a lists of audio formats available with the current
      install of SoX.
  
      Returns:
      --------
      formats : list
          List of audio file extensions that SoX can process.
  
      '''
      if NO_SOX:
          return []
  
      so = subprocess.check_output(['sox', '-h'])
      if type(so) is not str:
          so = str(so, encoding='UTF-8')
      so = so.split('\n')
      idx = [i for i in range(len(so)) if 'AUDIO FILE FORMATS:' in so[i]][0]
      formats = so[idx].split(' ')[3:]
  
      return formats
docs: Calls SoX help for a lists of audio formats available with the current
      install of SoX.
  
      Returns:
      --------
      formats : list
          List of audio file extensions that SoX can process.