While PT has the PGRTA, which is a very nice RealTimeAnalyzer, what happens if you need to compare two tracks together?...Enter the MultiInspector.
There is a free version that works at 44.1 and a pay version for higher bit rates.
It allows you to open a 31band analyzer on any track...then go to another track and open another instance of the analyzer and it will link to the previous instance(s) on the other tracks. This allows you to see (in one display with seperate colors) the RTA of the two tracks. Now you can see why the bass is muddy sounding when the synth part starts, or why the guitar gets dirty sounding when the bass plays, etc. and make the necessary adjustments on the EQ's for the tracks.
Excellent idea; excellent tool that works in PT-
http://www.vertexdsp.com/products_multiinspectorfree.html

I do not work here, but the benefits are still awesome
Make your sound your own!