In the file edit line you have to select the file with Sigma and Delta signals.
Enter the whole file address. If there is no such file it will be indicated
above. If the file has another format than assumed one you also will be notified.
Problems can arise while calling this GUI from another version of Matlab than
Matlab 7. In that case (if you are able to start at all) the file read procedure (dlrmread) could behave in a 
different way forcing you to change several lines of code.