Update app.py

app.py

@@ -10,7 +10,7 @@ from scipy.io.wavfile import write
 
 
 @st.cache_data
-def np_to_wav(waveform: np.ndrray, sample_rate: int) -> bytes:
+def np_to_wav(waveform: np.ndarray, sample_rate: int) -> bytes:
     bytes_wav = bytes()
     byte_io = io.BytesIO(bytes_wav)
     write(byte_io, sample_rate, waveform.T)