HowTo: smooth block climbing

I was wondering after seeing lots of demos that it is possible to smoothly climb up the block. It looks as if you slide upwards. It is most noticable in a0ke-s demo for goldbhop when he climbs that "stairs" like they really are stairs.

I've managed to do something similar if I jump few units before block but then I always lose speed, and I've seen that in most demos they don't lose speed.

What is technique behind this?

I have it on down, up is for +jump.

well. i would recommend scrolling the mwheel when you're really close to the next step of the stairs. almost hitting it. ALMOST.

practice..
need dbl duck in the face of the stair:)
some1 climbs it like an ordinary stair .. xD