I'm afraid I turn off the mastering compressor and eq on my G70. I prefer outboard eq and compression (you GOT to try the FMR RNC comp in 'super nice' mode!) and really feel that half the sound problems people say they hear in the G70 come from too radical compression and eq settings in the factory defaults. Less is more......
The way to get a good 'live' sound is to NOT compress your keyboard - it doesn't have half the dynamic range (or less!) of a real band, and over-compressing that already compressed dynamic makes for a 'squashed', small, flat sound with no life. Try to almost exaggerate the dynamics, and then strap a good multi-stage compressor on the final mix of your show. That way, your whole mix comes out smoother, not just a squashed keyboard and very dynamic singing and whatever else you are playing with.
Trust me, the only good way to get a good idea of what real band dynamics are is to PLAY IN ONE....... and then take those experiences with you to your arranger, and don't settle for that 'CD' sound. Try to sound like what you are imitating, NOT a CD of it.........
Now, if you really want that CD sound, by all means go ahead and squash it all to death, but any decent mastering engineer will tell you, each and every song and arrangement needs different compressor settings to avoid pumping and breathing, and most of our keyboards only store the master settings globally, NOT per registration. It is FAR easier to mess up a track with compression than it is to improve it.
The G70's vocal settings need to be written to a registration (or UPG in Roland-speak), and then that registration can be made into the startup UPG (power up selects whichever UPG you choose in the Global page). The vocal section has it's own dedicated eq and compression section, you shouldn't have to mess with the master eq to eq your vocal mike.........
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An arranger is just a tool. What matters is what you build with it..!