Sorry for late reply.
Scroll down this page, and there's a list of CV's I have amassed in the MTH PS3 units. The DCC settings can be different between locos and sound files.
https://elmassian.com/index.ph...d=324&Itemid=362
Your question about smooth running will be mostly the standard CV's 2, 3, 4, 5... have not found any BEMF settings or the like.
Greg