Dwight & Steve, thanks to both of you for the kind remarks. I have really enjoyed this project that I almost gave up on. I was thinking that what the heck I have the mars working on F5 so what is the big deal. However, by doing this flowchart, I saved the F5 key for something else and I could have made the upper headlight, not mars, by programming the "upper HL as Aux2.2 and programmed to an F key but that would have used up another key. So basically I have saved 2 F keys for something else.
Now I am getting auntsy to add a new .wav file to the decoder to add an old fashioned "ahooga horn", that way I would have normal steam whistle, air horn, as well as the ahooga horn. That would not be prototypical, for sure, but well accepted by viewers during operating shows.
Thanks again!