I use melodyne to correct vocals, it can also be used to make and effect sound on a vocal, or if someone has hit a sour note on an instrument it can be used to correct that. You can take your vocal and then raise or lower it to create very realistic harmonies. If you have any further questions, just send me a private message and i will try and help any way I can.

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Psalm 57:7 My heart, O God, is steadfast, my heart is steadfast; I will sing and make music.