OK, I see...
Well, there's no shortcut unfortunately. I think most live-players recognize your problem, at least I certainly do. The difference between playing at home or in a small rehearsal room, differs greatly from playing a larger live venue. What frequencies will be louder or quieter depends on the acoustics of any room... size, wall-material and inventories for example, all affect the sound. That's one major reason for having sound-checks.
I'd say, set the volumes so that they work well where you are rehearsing. Having done so, it will be much easier for the mixer guy to attenuate or boost any frequencies that he notices are feeding back (feedback) or are muffled (or disappear). There are special EQ's with feedback detection that can do this too, they detect what frequencies are feeding back and automatically adjust the EQ bands to sound as it should. But this will have to be done before a gig, at soundcheck, as you have to use a mic in the room, for the EQ to measure the frequencies and adjust the levels accordingly.
The most important part is to focus on getting it to sound as good as possible where you rehearse, firstly. Then, secondly, if there are some patches that STILL get too loud sometimes when you play live, you could use a compressor/limiter, to limit the maximum volume that the Rev2 can reach. If the Rev2 should "try" to go beyond that level, it will be compressed as to not exceed that level. But I advice against STARTING with a compressor to solve the problem, instead rather use it as a last possible solution, or to iron out the last bits. Or else it could affect your sound in negative ways.
Chances are the mixer-guy will have a compressor to spare for this job.
Oh! But if you use a computer and software live, you could use software EQ's and compressors on the PC. There must be feedback detection as well, but it would still involve you having to "measure" the room levels with a mic.
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