A "screaming coach" who ostensibly has an entire academy of aspiring screamers has explained compression!
I could not have made this up myself. Here are his exact words:
"Put your hands lightly around your own throat and act like you're being strangled. Don't actually squeeze hard from the outside, just let your body react to the idea of it. Notice how your throat naturally clamps DOWN and closes up on the inside. That's compression! That's the exact sensation you need for a solid fry scream."
Wow! I can only imagine how great all my favorite songs would sound if the vocalists had only sung as if they were being strangled at the time!