One last update for the benefit of others who might find this thread. Exploring based on Marc's comments, I found Digitrax's Soundloader 2 software and installed.? My PR3 worked the first time, no issues with the communication.
Soundloader is very crude compared to Decoder Pro, but at least I can read the CVs (my Digitrax system uses a 20-year old DB150 command station that can't read CVs) and get a couple new locos speed matched which is what started this project. My brother is a true computer expert, next time he visits I look forward to returning to this thread to get JMRI/Decoder Pro up and running someday soon - your kind help will not go to waste.??
