I currently working on a 7DL16 soundset for Amtrak's great and all mighty (hint on heavy sarcasm) P40DC and P42DCs. They are still a heavy WIP but hell I think they are off to a great start. I have though ran into a small problem. With my lack of knowledge of the ProxyXml files I can not understand how to a add new sound streams to it for instance, the HEP for exterior. But I got the interior working by swapping out a sound file that was not need in the GE soundset. If anyone could shed some light on this that would be great. But none the less, here is the sound preview enjoy.

https://soundcloud.com/tyrone-kunta-jackson/railworks-p40dc-821-7fdl16-821
Thanks,
-Ryan R.