Usually I match like with like (gut/gut, nylon/nylon, etc.) but may go to stiffer, stronger, & if possible less stretchy material from nut to pegbox. Some players do this routinely to get two lengths out of a string, and some have done this precisely to make tuning faster & more sure with the less flexible material running form nut to pegbox. Braided fishing line can be good for this, but hard & slippery can be tough to tie- like polished nylon or carbon fiber; these can be roughened with sandpaper.
Dan >Suppose a string broke betwen the nut and the peg, so you needed an extension >to reach the peg. What material would be best for the extension? -- To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
