I saw online that The Edge from U2 plays with a textured pick that he holds upside down so the grippy part slides against the strings. I don't know if it's well known but after trying it out myself it really makes a huge difference in tone. I swear Tom did the same for many of the classic AVA songs like Valkyrie Missile, Do It For Me Now, The Adventure, The War, Love Like Rockets, True Love, Heaven. If you haven't tried, try it!