Reverb definitely at gigs. I like to think I'm sizing the overall (sound system) reverb to the room I'm in, altho this is pretty intuitive. I'm too inept to manage delay in a live situation. I use it - listen to the soundcloud link in my signature - but arriving late in life to the use of guitar effects I keep things very simple at the gig. I've got some set & forget trem and OD settings I turn off depending on the song, and I change pickup settings, vary picking/playing style, etc.