Don't have one... I just generally turn the stuff off.

I have always felt that the Mastering stuff is more the 'final polish' and live room compensator. The trouble is, if you leave the stuff on, then do your style balancing with it on, certain things always pop out or get submerged, so you work all your styles up to compensate, then, if you find yourself needing to change the compressor settings or Maxx and EQ (in a dull room or over bright one, or you get a fuller PA, etc.), and suddenly, a lot of your styles get out of whack.

Generally, most of us don't work on our styles while running through a great flat set of studio monitors, so once again, you can find yourself doing some bad things to style balances and EQ to compensate, then you go out to the gig with a big full system, and suddenly it's all bass and kick, or shrill, whatever.

So, although my G70 doesn't have Maxx, it does have a 3 band compressor and parametric final EQ, but I work on all my stuff at home without them on. Then, on the gig, I adjust as needed. I tend to like my sound as 'live' as possible, and to that end, try to keep my drums and bass nice and hot, and if there's one thing that's the kiss of death to a good drum sound, it's too much compression! Especially when maybe it's the bass part ducking it, or whatever is loudest in the mix.

Tread lightly with those tools, if you want to keep it sounding live! For a CD, or quiet background music, sure, squeeze it down as much as you like. But if you develop your sound with them already on, it's MUCH harder to change it after the fact...