Look at this site > http://www.michelvoncken.com/
Go to video and look at the vocal harmony workshop, it is in german but you can look to the display settings and listen to the examples.

Regards,
Arno.
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Genos2,Korg Pa5X , Yamaha YC61, Ventilator2 . : https://www.youtube.com/channel/UCmC6hdAR1v5lYN8twfn0YbA