Running your example code I get "cannot unpack non-iterable NoneType object" from the line scipy.io.wavfile.write("techno.wav", rate=16000, data=audio)

Windows 11, python 3.10, scipy==1.10.1

Anyone see the same thing?

EDIT

I just realized that this is not being thrown as an error, but logged to stdout. Windows does not like the resulting wav file however.

EDIT 2

After casting the aduio to float32 the wav file works on windows.

scipy.io.wavfile.write("techno.wav", rate=16000, data=audio.astype(np.float32))

still get the NoneType message but that's not a big deal