Not sure I agree with the criticism of the tool - I've just started using this, and as Michael R.E said, it's picked the parallel motion between a couple of different voices. That's what the tool is...

Vaughan, thanks, I've learned something & fixed the title. Don't do forums much (like no-one can tell). Thanks again to everyone for helping a newbie, even if there is no satisfactory answer....

Thanks Dr. Wiggy, MikeH & MikeR for your rapid repsonse. I have the trailblazers book, it is excellent, but it is not exhaustive. Printing out a non-linear PDf is not an option - A manual works...

I have used PrintMusic since around 2006. There was an option of printing up the user manual rather than looking at it on screen - the former is often easier as you can open a flip between pages...