u/ADVivare

As indicated in the video, I try to get a clear/crispy tone for my high, and I currently feel a higher tone mainly because of the nasal resonance. I get a decent pitch, but at the same time I have a strange feeling, even in the sound; it’s like a rumble/roll (the distortion that cuts off for a fraction of a second). Is it another distortion? How can I resolve this issue?
(My lows aren't affected as you can hear.)
Ty