Karl, I couldn't get that page to download, but here is another one which seems to work:
https://sourceforge.net/projects/dsa...e=typ_redirect
Richard - at least one will be available, feel free to make an offer (all for charity as per forum rules) by PM, or two offers in the case of a unit which turns out to work, or not to work! In the latter case, it will be well beyond my capabilities to fix!
Now I seem to have a manual I can have more of a play to see what happens. The manual is nice - user tutorial, discussion of aliasing, all sorts.