The duration of the sound would change too- that’s why sped-up tapes sound chipmunk-like. ![]() Nevertheless, sound engineers can’t simply change the frequency itself. So, using a computer to correct the frequency back down or up would ensure that recording sounds in tune. In the system usually used by MIDI instruments in which pitch is assigned a number, with 440-Hz A being 69 and each semitone increasing or decreasing the pitch number by 1, it is related to frequency F by a simple formula. The goal of pitch correction is to retune a slightly higher or lower note to the nearest semitone. The difference in note between two adjacent keys on a piano or frets on a guitar neck. Musical scales are divided into 12 pitches each separated by a semitone. Therefore manipulation of the frequency can produce a different note or hit an exact note from a noise that is slightly off-key. The A above middle C is usually defined as 440 Hz. ![]() The pitch of the note is dependent on the frequency of the sound wave. ![]() If they are little out of tune, the vocal track can still be rescued – or ruined, depending on one’s point of view. sometimes, the pitch of their vocal slightly misses the exact note they are trying to hit.
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