Hey guys, i been doing vox for about a year and a few months, I've nailed highs and basic lows, but i wanna branch out into some sick mids ( think parkway drive, the ghost inside and all those hardcore bands ) and into some deathcore styles

Now people, watch this video of these 2 vocalists.
http://www.youtube.com/watch?v=ttn1otpx7zA&feature=fvw

can anyone tell me where the fuck to start? Like seriously, i'd kill to learn how to do those vocals.