Very useful and fun!

Very useful and fun tu use app, especially when you have not your guitar at hand for practicing. I find misguiding the white spots numbered 1, 3, 5, 7, 9, 12... Since they start from the "0" fret (is it a bug?).
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UPDATE:
The app developer, after my previous comment, promply wrote to me in order to clarify the "fretboard issue" I pointed out. It was MY MISTAKE to have set the tuning 1/2 step down.
I have been the chance to discover many other useful and subtle (and yet easy) settings.
I have tried other apps with the same purpose and this is hand down the best.

paobat about Guitar Sight Reading Trainer, v3.0