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 Stagepas 100 BTRs / Senn e935 - LIVE
Roland RD 2000 / Tascam DP24sd / ATEM switcher - STUDIO