Yes indeed on all that models was a sort of pitch correction, However it didn't sound as good as in the T4 example.
If you cant hear that difference ,you must be deaf.
Let someone show the same quality on YT to proof,No chance .

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