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Vocal processors or vocal effects pedals are used by singers to modify and enhance their voice in real-time during a live performance. They can be used to change the pitch, tone, and timbre of the voice, add reverb, delay, and other effects, and create multiple part harmonies. This helps to widen the dynamic and expressive range of the voice, and can also make the sound more interesting and enjoyable for the audience. Some popular vocal pedals include the TC-Helicon VoiceLive Play, the Boss VE-20, and the Rocktron Banshee.