I have not seen user settings for the M13, probably because it just models stompboxes as opposed to amp/effects combinations. I normally just either listen to a song and try to derive what effects are used for find some resources on the net for what my favorite artist use and their settings. For example if they use a tube screamer; the M13 has an emulation for one.

I've built up a really neat scene that sounds like the beginning for "Good Morning" from "The Dandy Worhols"...