A2s are critical to a good rehearsal and weekend. They set up all the audio gear, document the patch for the FOH operator, and, in general, cover all the little details so that the musicians and FOH op can put as much energy as possible into rehearsal. To me (Justin), the A2 is similar to the guys who paint the lines on a football field. No one ever thinks about them unless something is wrong (like every production position), but, if they don't show up, the game can't happen.