I don't believe OP was asking about the double stops. His title, and initial post, say sliding. At 0:42 he starts sliding up from below some of the notes he's playing. In case there's any confusion 760, double stops have nothing to do with slides. A double stop is playing two notes simultaneously. I think JimK simply misunderstood the question.
I'm not very good at teaching, but I'll try. What he's doing is striking a note below the root, sliding quickly up to the root, and popping the octave.
If you read tab, I'll show an example. ^ = slide up. S = slap. P = pop. x = muted
Code:
G|-----5-----4---4-----4-------9-----9---9-----9-||
D|-----------------------------------------------||
A|-2^3---x-3---2---x-2----2-^7---x-7---7---x-7---||
E|-----------------------------------------------||
s p s s p s p s s p s p s s p s p s s p
Notice that the note that's slid into, is not slapped. It's much like a hammer-on, in that your left hand is articulating the note alone.
I hope that helps. If not hopefully someone else can explain it a bit better.
Shane
