Outside of native plugins, iZotope's Vocalsynth, Melda's MHarmonizer, or zplane's Vielklang can all produce a clean harmony. These are all pretty high quality and can automatically keep things in key. I recommend playing around with the different options and seeing which one you like best. (They all have free trials available.). Source: almost 2 years ago
Do you know an article comparing Zplane Vielkang to other products?
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