Thor
i’m exactly where you are. i couldn’t resist fiddling with it, and then had a whole load of questions.
the only noise i can detect is a slight grating as the grinder slows down. i’ve zeroed on that. if i go finer, the noise does not become any more distinct - perhaps it will with time. i’ve checked all the set points and the factory one is best for me - so i am happy with it, and happy that i know where it’s at. now i just use it.
i could perfectly understand you being at setting 3. my current coffee requires setting 4. reassuringly the niche zero on the same beans is at setting 12 which is as fine as i would normally get, so i hope that 4 on the duo is the low end of the range for me, but it is what it is.