The harmony effect is also called the chorus effect. When the chorus performances, each person's timbre will vary in pitch, volume, and pitch. There are some differences. For example, the A tune sings 440Hz, some sing 441Hz, and some sing 339Hz. The combined effect of these sounds is: A particular timbre cannot highlight a certain sound, but should be a holistic, collaborative, coordinated sound, hence the so-called harmonic effect.
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