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Историческую версию Quarter flat Diapason Metronom можно получить на Android
Диапазон и метроном с четверть плоских мелодий для восточных инструментов
This app is a Metronome and Diapason with smooth quarter flat tunes that can be used to tune all kind of musical instruments even oriental / arabic musical instruments that have quarter tunes
one thing that make this app special is , the diapason sound is not electronic sound and it is exactly like the old U diapasons. also the metronome sound is not digital . the metronome sound is exactly the mechanical metronome voice
i don't explain too much you can see that yourself
don't hesitate . you can download it for free.