This could be the same kind of technology used in Gnashville studios to make non-singers warble on key. Anyone you know?
I recall years ago when some company came out with a device that enable one singer to sound like a group. Doing all the parts, with a little practise, it didn't sound half bad or good. The high parts were kind of like Mickey Mouse on steriods. Not quite the Jordanairs.
They've improved it since. Cheers- Dave