docstr: 1. load wav
  2. set normalization parameters
  3. extract mel-spec
  4. invert to wav and save the output
code: def test_audio_synthesis(self):
      """1. load wav
      2. set normalization parameters
      3. extract mel-spec
      4. invert to wav and save the output
      """
      print(" > Sanity check for the process wav -> mel -> wav")
  
      def _test(max_norm, signal_norm, symmetric_norm, clip_norm):
          self.ap.max_norm = max_norm
          self.ap.signal_norm = signal_norm
          self.ap.symmetric_norm = symmetric_norm
          self.ap.clip_norm = clip_norm
          wav = self.ap.load_wav(WAV_FILE)
          mel = self.ap.melspectrogram(wav)
          wav_ = self.ap.inv_melspectrogram(mel)
          file_name = "/audio_test-melspec_max_norm_{}-signal_norm_{}-symmetric_{}-clip_norm_{}.wav".format(
              max_norm, signal_norm, symmetric_norm, clip_norm
          )
          print(" | > Creating wav file at : ", file_name)
          self.ap.save_wav(wav_, OUT_PATH + file_name)
  
      # maxnorm = 1.0
      _test(1.0, False, False, False)
      _test(1.0, True, False, False)
      _test(1.0, True, True, False)
      _test(1.0, True, False, True)
      _test(1.0, True, True, True)
      # maxnorm = 4.0
      _test(4.0, False, False, False)
      _test(4.0, True, False, False)
      _test(4.0, True, True, False)
      _test(4.0, True, False, True)
      _test(4.0, True, True, True)
  
file_path: TTS/tests/aux_tests/test_audio_processor.py
imports: import os
  import unittest
  from tests import get_tests_input_path, get_tests_output_path, get_tests_path
  from TTS.config import BaseAudioConfig
  from TTS.utils.audio.processor import AudioProcessor
label_desc: Use image node_id 2 for calling the TestAudio obj's underlying member method code with example usage: obj.test_audio_synthesis() without return types