Like I told you in yesterday's post, you can only get so far in a mix without adding some space to flesh it out.
EQ and compression will make everything really tight and separated on the two-dimensional plane but to really add some extra dimension to your mixes you need to use reverb and delay.
So continuing on down the five plug-ins I think are the most powerful to get a great mix we'll move onto reverb next.
Check out the introduction to reverb for some advice on using reverb in your next mix.