Well his DSX are EMD and Alco and that is a Baldwin. IF you go that route, I would use the Alco, it has more of the baldwin sound than the EMD. I'm not sure how many people can tell them all apart. The Alcos do have a rather rattling type idle sound which makes them quite fun.
I have some Weaver RS3s and FAs that I could use some DSX for also. I have a couple from a friend and they work fine. I wish they still made them.
Both Digtrax and MRC still make a sound only decoder. I have a couple of each and they each aboug 6 different diesels on them. I like the MRC sound better. Not sure if either have a baldwin.
I find the 408 is a really great decoder for motor control and can drive about 6 other options for lights and what not. There is an amp limit on the options however.
