Well, it turns out that - contrary to much of the advice across the internet - enabling microstepping doesn't make operating a stepper motor quieter.
If anything else, it makes it noiser.
At least that's what I found, when I enabled half-stepping on my A4988 driver board.
Enabling quarter-stepping made it even worse!
Far from making everything smoother and quieter, it made the stepping more pronounced and obvious, and the noise from the motor got noticeably louder.
It looks like I'm going to have to try one of those ultra-quiet driver boards after all....
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