I have always wondered, in "welcome to the jungle" just before Axl sings "you know where you are" slash does some crazy delay/volume swell thing, what is he doing?
Definitely delay, that's obvious. As to whether it was a pedal/rack in his rig or done from the console, most likely the console. When recording, it's recommended to mic everything dry and use the delay/reverb through the console. Who knows though. I wasn't there so I can tell you exactly, just speculate.