I have found a decoder for my SD70M but i had a horn question. I have 4 of the same decoders im looking at, but which horn is better for a Union Pacific SD70M the Nathan 3-Chime, Nathan K5, Leslie 3-Chime or a Leslie 5-Chime.
Union Pacific uses several different horn models, however, the Nathan K3LA and K3H are used in quite a number of their modern locomotives.
Here is an SD70ACE with a Nathan K3H:
http://www.youtube.com/watch?v=LJY3iDa2Bak&NR=1
Here’s UP 6682 with a K3LA: http://www.youtube.com/watch?v=AkqL4AtNaW0&feature=related
Which decoder do you have as there are several models of Nathan 3 chimers and that sound compeltely different from each other.