By different sounds i mean vocals instead of kick... or whatever... the shape of the dynmaics of the sound dicatates how the peak operates the pumping.

Im not sure about the lack of pumping you talk about, im not there with you, doubtless you're altering a setting you shouldnt be doing, but without being there its hard dude... sorry!

remember you are dealing with dynmaics and as such any change results in change elsewhere.

Try creating a pattern with the sound that is running to the peak controller, its like placing a pattern on a pattern. Try using a filtered sound that does random shit instead of a kick drum.. nice.