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Историческую версию Music Tools можно получить на Android
Калькулятор для музыки
Music Tools : Calculator for Music, Simple & Fast
> Delay and Frequency Calculator : Calculate length in milliseconds & Hz for several note values.
> Changing the Tempo Calculator : Calculate the change in tempo makes semitones & percent.
> Tap Tempo BPM Calculator : Calculate a BPM(beats per minute) by tapping on the button.