That may be the dumbest question I ever ask, but I realize that I never had to switch guitars during a gig (never had to rely in a spare guitar, lucky me), but I am playing a gig soon where I will need to switch guitars (one song requires a tremolo which I only have on one guitar, but not my main one). How do I switch easily without making an awful sound when unplugging? Should I just turn my amp off and then on again? I would need otherwise to signal to the sound guy, but I don't know if he will be there at the mixing table the whole time. How do you guys do?