Most Newcomers fall into the trap of dragging yet another effect onto a clip which has already an effect applied.
The results are met by questions on the Forums like, "Isn't it possible to add multiple effects to a clip?"
Here is the answer - Yes, it is.
And here is a very simple look at the procedure of nesting effects.

Regards,
Douglas

in effects edit mode, how do you control each effect individually, if they are on the same track? 

thanks

Use the little down arrow to Step into the nest.

Each effect is on a different track in the nest