If most of the noise is generated by acceleration of the printhead, NetFabb lets you manually set the maximum acceleration in the extended setup of the machine. Its default is 7 m/s2, so you can lower it and see if the noise goes down. Of course the build time will go up, depending on how many changes in direction and speed are needed.
I have little experience with other slicers.
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msurunner 2
The noise is a product of the accelerations in the printhead. You are undoubtedly getting different sounds due to the different approaches each slicer takes in reading how to generate the g-code. As the largest impact in the way it generates the g-code is going to be what the part physically is, it would be particularly difficult to quantify which is the most quiet.
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