Portal 2 (Spoilers Possible)

[Marth]

not sure I'm describing it right but; you have two pipes, one pumping in the repulsion gel, and one pumping in the other gel. There's a hanging walk way with a cube on it, I get the cube and put it on the switch and a panel flips right side up. I don't know where to go from there because I can't use the speed/gel combo to get on it, I'm guessing I need to drop from some height, land through a portal and go off the ramp?

EDIT: After reading what I just wrote, this explanation really, really sucks. But I really don't know a better way to describe it.