Because it doesn't have it. You always see random comments like that in DAW threads where somebody says.. "X can do that, has been doing that for years." ... when it's often enough simply not true at all.budweiser wrote:^^ Really ? I own studio one and don't remember something like that.
You can get there easily enough with Audio Bend and Groove Quantize (extract groove from harmony A and apply it to harmonies B, C, and D to align vocals) but no, it doesn't have a tool designed specifically for that function like a Vocalign clone or similar.