Oh forgot to mention, Dyrobes developer will call you back the same day if you email him. Dr. Wen Jeng Chen is his name, give him a call or email from the website (search for dyrobes).
Dyrobes can be used in excel too. You have to save the file as a .txt (just change the extension) file and import it into excel as a .csv After mods change the filename back to the DyRoBes extension and it can be read in (it's still just a text file).
It's good for shafts and symetric systems...