Looking at using pink noise to flatten EQ response in room.
Unless you like to piss off all the patrons in the room you're about to perform in don't go there. Instead use pink noise and the RTA or Smaart to flatten response of the speaker system in a non reverbant environment(outdoors) and save this as your baseline. Then when you setup indoors you know
any non linearities(booming bass, piercing highs) are caused by the room and should be fixed with speaker positioning and room treatment first(where possible) or minimized with EQ second.
I find RTA to be useless.
That's because it's like trying to illuminate a large room with a flashlight, in order to see the whole room at once you need some way of taking a snapshot at each flashlight position and pasting them all together in a big collage.