code: def mulaw_decode(*, wav, mulaw_qc: int, **kwargs) -> np.ndarray:
      """Recovers waveform from quantized values."""
      mu = 2**mulaw_qc - 1
      x = np.sign(wav) / mu * ((1 + mu) ** np.abs(wav) - 1)
      return x
  
imports: from io import BytesIO
  from typing import Tuple
  import librosa
  import numpy
  import scipy
  import soundfile
  from librosa import magphase, pyin
label_desc: Use image node_id 29 for calling a global function with example usage: mulaw_decode() and returns: x