Neil, why don't you take a look at the A 157b alternate firmware, it probably packs more features than the A 157 was originally going to get and the updater has windows, iOS and linux versions. As it has so many features it is more complicated to use but once you get your head round it it's very good! It's still a work in development and the man behind it (Christian Rusche) is open to suggestions for more features in a future release. It can be found here:-  https://www.rusche.ch/a157b