User incompetence. I can make any harmonizer sound SO much better than any demo I ever heard. Even my 25 year old Digitech stuff sounds better than the newest demos on line. What's WRONG with these manufacturers???? Why don't they use competent people to demo the units?
To be fair - this girl (Laura Clapp) is about the best I've heard, but still ... no cigar.
https://www.youtube.com/watch?v=XbF9DPsU6Qs

I agree, Dave. Laura is really good, you may be even better. Most of the folks never learned vocal control, which is imperative when using any harmonizer/vocal processor, either onboard or outboard.

Gary