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Okay, after getting a bit more familiar with Python, it turns out that it was just a quite silly mistake on my part: when I unzipped your scripts, I had simply placed the resulting *folder* in /Scripts, so they actually were *not* in the exact same folder as sws_python.py, as required. Dragging them one level up solved the error. Anyway, making such silly mistakes is an essential part of learning.
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Before trying to expand its functionality (I already have a couple of ideas to keep me motivated to dig in further), I'm now trying to get a bit more familiar with the syntax first. Modifying your script to my style preferences was a great exercise. I should probably do a few tutorials and get a bit more familiar with the Python standard library and specifics of ReaScript next.
Btw, Live 9 will also get automation curves, but will apparently not yet have quantisation for automation values. Thanks for helping keep REAPER yet another step ahead of the curve.