Yep, I'm half way through my list, for setting both the gamma and brightness, as well as the volume down on the loud ones. I have found that the loud ones need to be set to about -30 to -40db to match most of the quiet ones (some of the quiet ones are too quiet to bring the rest down to match). The slider settings for the other settings excluding the master volume will hold their settings. It seems like the audio cores could be made to match each others volumes if someone had the time and knowledge to do so, until then, you're left to setting the individual sliders per audio core per game. (and hoping they don't change the .cfg structure in the future)
Wait until you want to match the volumes in Hyperspin's videos too, that will be a challenge.