Necris
Bonitis.
I agree partially. You definitely can control the relative pitches of screams both high and low (black metal and death metal styles). And im sure if enough practice was put into having a smooth transition between the two you could conceivably have a decent range of actual notes while doing this type of vocals. But I don't the the fact that no-one does it has anything to do with skill or talent so much as either no-one really ever considering it, not caring to learn it or not knowing how to go about learning it.That's BS. Maybe growlers just aren't talented enough to control the pitches, but it has pitch.