This command lets you automatically or manually convert sharp corners into radiused or fillet corners, specifically designed for creating push through letters.
Outer Radius
This is the radius to use with outer corners, which are "right turns". For example, a square that is ordered clockwise will have only outer corners. A "W" will have three inner corners or left turns
Inner Radius
This is the opposite turn from Outer Radius, above. These are left turns. Note that these are opposite with inner loops, so that outer radiuses become inner radiuses and vice versa.
This tool has a manual mode, in which you can simply left click on individual corners to convert them to radii.
Only nodes with a tangency error of more than 10 degrees will be converted to radii.