I think the band his been using different electronic tricks, enhancements and what not since the very beginning. Even back to "Boy" there are different vocal echos and synthetic elements (accepting that bass, guitar, drums and vocal would be the natural elements). Really, ever since The Beatles and George Martin began their sonic experiments in the mid-'60s, electronic elements have been so prevalent, of course not to the degree that started in the '90s with people like Beck, The Prodigy and all those DJ-centered groups, but it's still been there for a while.