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  • A pure tone is a vibration of air back and forth at a certain frequency.

  • And it sounds like this.

  • [tone]

  • If you want to raise the pitch of that tone, you can speed up those vibrations.

  • [higher, shorter tone]

  • But because you've sped the vibrations up, that tone doesn't last as long.

  • Slow it down...

  • [lower, longer tone]

  • ...and that tone will go on for longer.

  • Pitch correction, or auto-tune, is clever.

  • When it changes a note that someone's not quite sung correctly,

  • it changes the speed of the vibrations,

  • but it also adds or removes some vibrations so the duration stays the same.

  • Except that's not quite the full answer.

  • Because musical notes don't sound like this:

  • [tone]

  • They sound like this.

  • - ♫ Hello ♫ - ♫ Hello! ♫

  • - ♫ Hello... ♫ - ♫ Hello~ ♫

  • Ladies, gentlemen, and all in between,

  • the Gregory Brothers.

  • Oh yeah, some talent's still require~d ♫

  • [effects and auto-tune fade out]

  • [note continues]

  • [gasps]

  • - I know we're wandering off, but I thought that sounded pretty good.

  • - That certainly worked for me.

  • [laughter]

  • - That's good. - It's a powerful note.

  • - That hurt! That actually hurt.

A pure tone is a vibration of air back and forth at a certain frequency.

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