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Add a simpletest: a synthio chord saved as a WAV - #325
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examples/audiodsp_simpletest.py: a synthio chord through an audiofilters low-pass, pulled withaudiocore.get_bufferinto a WAV file. It needs no speaker.Run on the unix port of MicroPython, the unix port of CircuitPython and CPython 3.12. All three write 2.0 s at 22050 Hz with peaks at 261, 329 and 392 Hz; MicroPython and CPython write identical bytes. The getting-started page links it.