Ive been in this business for 20 odd years now..mostly with the big O.....and I'm a bit confused on what you actually want....Otis have been using the 1E, 2E etc from day dot...and to say that someone doesn't have the knowledge to answer your question is downright rude!!!!You don't know the answer so why say that!!!...the answers that have been given are a VERY good start (and very informative to me too) so have you ACTUALLY taken the advise or just poo pooed it thinking it isn't going to help!!