[Zoltán] sends in his very interesting implementation of a NumPy-like library for micropython called ulab. He had a project in MicroPython that needed a very fast FFT on a micro controller, and ...

We agree it is simple, but actually, it isn’t so much Python ... write the data to a WAV file. The basic idea is to create an array of samples in a buffer using some features of SciPy’s NumPy ...