Mind's Clay

Is it possible to get the particles of an emitter to follow a path?? I tried creating a tube and turning on object collision but many of the particles end up getting out of the tube.

No matter which blending mode I choose, I don't see anything happen between actions. I just get a hard cut from one to the other. I tried overlapping the actions and then I had no actions at all. I had to delete all actions and start over. To me blending means to transition from action to the other, that probably not correct. None the less, I don't see any transition from one action to the other even when "Transistion to next action" is selected. Any insights?