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Auto-Tune provides two different approaches to pitch correction.
For most common pitch problems (and correcting live performances in real time), Auto-Tune Automatic Mode instantaneously detects the pitch of the input, identifies the closest pitch in a user-specified scale (including minor, major, chromatic and 26 historical and microtonal scales), and corrects the input pitch to match the scale pitch. A Retune Speed control lets you match the retune rate to virtually any performance style.
For meticulous tweaking, the Graphical Mode displays the performance's detected pitch envelope and allows you to specify the desired pitch using a variety of graphics tools. This mode gives complete control over the correction or modification of the most elaborate expressive gestures.