3 ms·

Obviously C4 should be 256Hz. This has the important property that it makes C-3 2Hz, which is another name for 120bpm. In equal temperament, this makes A4 430.

Obviously C4 should be 256Hz. This has the important property that it makes C-3 2Hz, which is another name for 120bpm. In equal temperament, this makes A4 430.5Hz.