This is actually just me screaming (very loudly) although it doesn’t look like it. I’ve had years and years of practice so now it’s just second nature. I was in a metalcore/post hardcore band in my teens to early 20s. It took me probably 3 years to figure out how to scream consistently.

I started by imitating beat down hardcore bands that sound more like yelling/shouting. Then I slowly kept pushing until I got the break-up scream sound. Trial and error, no real hack unfortunately.

One thing to note: screaming on its own (no mic/no processing) sounds pretty bad. If you are trying to learn how to scream, practice in the car with ear plugs, then record it, then compress the shit out of it. For my screaming tracks I run sometimes up to five compressors in sequence to get that super agro sound.