It's different on every song depending on what's needed but there are always instructions for the drummer so that he knows where the filles are and such. You can blend in the tracks and the vocal instructions separately along with all of the other instruments. Our MD records everything in his studio so the tracks are all audio...mixed down rather than trying to have all of the tracks playing live. As I said sometimes it's additional keys or bass or bari sax since I already bring enough stuff as it is.

Sometimes it's strings or choirs or additional winds (some of his background orchestration is so intricate I almost lose myself listening to it instead of concentrating on what I'm supposed to be doing) or even just effects that would be too hard to trigger live since we mix from the stage. There are audio samples on the band's website
http://www.newmonopoly.com/New_Monopoly/Home.html. I'm in the pictures but I don't know if I'm in many of the current audio selections. I've only been in the band for a little over a year even though they've been together for over 12 years in various forms. I might be playing EWI on some of the modern tune recordings though.
So just to make sure I answered your questions:
It's all recorded audio, no live midi sequences
The pros are it sounds excellent and we can keep a huge song list ready to go even if something doesn't get called for a year - we only rehearse during sound checks
The cons? Maybe that we are locked into the same arrangement and things can't be opened up...but it's not that kind of band necessarily.
There are tunes that we just play live like Rolling Stones songs or other things from 4 or 5 piece bands.
Hope that helps,
-Barry