Specifically between 3.7.3 - 3.7.9 (3.7.10 will not work with the libraries you will need) Install Virtual Audio Cable for free from this site: https://vb-audio.com ...

I originally posted this as a numpy issue, but after some research it appears to be something wrong with mkl_fft, although it only happens under Python 3 (and only in later releases, where "later" ...