Cousin Ken,
Good points from UD. Don't let the naysayers sway you from using the built-in harmonizer. It is fabulous and you don't have to pay extra musicians that CAN'T normally sing on key anyway

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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)