In a studio, first thing they are going to want to do is turn off all that mid priced mastering stuff..!

They've got finalizers that cost as much as the entire arranger, sophisticated multi-band compressors, limiters, EQ's, you name it. Bottom line about that stuff is, you don't put it on until the mix is perfect... laying down the keys is only the first step (and any decent studio is going to want separate audio for each part, with no reverb).

And yes, on a gig, my friends PA3X's Maxx processor makes a night and day difference.