Re-using an emitter object several times

when i duplicate the Actionstrip nothing happens even if i bake all the frames of the animation, i think it is due to the start and end time of the emission, wich remains the same for the object, and if i change it in on one strip it changes it in the other because that data is refered to the object; should i create different emitters for each emission??? ain´t it possible to re use the object?
Thank you