Hey there,

I was wondering how to make this kind of vocal effect;
https://www.youtube.com/watch?v=o-oC02aWp-Q (00:06)
There's a monster-ish vocal riser under Britney's vocal.

Another:
https://www.youtube.com/watch?v=R4em3LKQCAQ (05:03)
There's same riser on here too.

I would appreciate any help! :)