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Dan Gordon (Canberra flute player and computer scientist) has produced a Real Time Tuning Analysis system for iPhone and similar devices. It can be obtained from the itunes store at the frightening cost of $4. Real Time Tuning Analysis was originally developed for flute - you can see the rationale and history behind it at: http://www.mcgee-flutes.com/RTTA.htm. But I suspect it will also prove to be handy in other fields such as concertina, enabling for example, anyone with an i-Thing to do a very quick and easy scan of the tuning of their instrument. One trap which will affect concertina players is duplicated notes. Obviously if you play a C scale and then a G scale on an anglo, the tuner doesn't realise that many of the notes are duplicated, and will produce a combined figure. So, test the various rows separately! The same goes for push and pull on an English system. You should still be able to produce a complete listing of deviations within a few minutes. I haven't tried this myself on Dan's app but it certainly worked well for me using the PC version, Flutini. If, like me you don't have an iPhone, you can download Flutini from the link above. To find out more about and to download Dan's app, go to: https://itunes.apple.com/us/app/rttatuner/id870470418?mt=8 Note that the app allows for different pitches and temperaments, so should be a good investigative tool for analysing period concertina tunings. I'll be pleased to pass on any comments on use for the app for concertina to Dan, so do leave them below. Terry