rasp, aka scratch...its when you deflect the air off of the back of your throat. which is where you get that static like sound from when people scream. It doesnt and never should come from your cords. the thing is you have quite a few muscles in the area. so you have to learn to not pull all of your throat closed or push extra on the cords when youre trying to do this. this is pretty much the key to longevity and "screaming". dont forget that a mic with good settings makes any screamer sound that much better.
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