I've drawn out this signal flow before.
You can add FX to tracks (cool!)
But you can also send Tracks A,B,C and X to an AUX FX effects area, meaning (for instance) all your lead vocal tracks can go through the same compressor and reverb in one fell swoop.

Or all the drum tracks can go through the same (AUX) EQ and reverb .. or etc etc.

Track FX go first, then these are sent to the AUX FX (in varying amounts using the send dial for each track) and/or these are sent to the Subgroups (again including FX) and then to the main outs.
Lots of routing possibilities once you grasp this.

Here's an old (basic) drawing ..

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Drawing1.jpg (156.51 KB, 23 downloads)
Last edited by rharv; 02/14/16 05:20 PM.

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