code: def _save_wav(filepath: str, seed: int):
      wav = get_whitenoise(
          sample_rate=_SAMPLE_RATE,
          duration=0.01,
          n_channels=1,
          seed=seed,
      )
      save_wav(filepath, wav, _SAMPLE_RATE)
      return wav
  
file_path: audio/test/torchaudio_unittest/datasets/librimix_test.py
imports: import os
  from parameterized import parameterized
  from torchaudio.datasets import LibriMix
  from torchaudio_unittest.common_utils import get_whitenoise, save_wav, TempDirMixin, TorchaudioTestCase
label_desc: Use image node_id 1 for calling a global function with example usage: _save_wav(filepath, seed) and returns: wav