#1
i not talking about the onewhere you bring your right hand over and hold the frets behind it but a simple barre for the back of the sweep. ahh i cant explain it very well just look at this video and tell me what the hell this guy is doin and where i can learn it.

http://youtube.com/watch?v=VhZ04cO0ciA

16 seconds in
#2
that vid confused me

i dunno why
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#3
It's just a different arpeggio, where the note on the lowest string used is at a fret farther to the left than all the others. It's hard to describe it in words, but he's basically just holding the root note of the arpeggio.