Thanks, DJ for the offer of the drawing, but not necessary. Since you are successfully programming with Decoder Pro with the Superchief and a PR-3, that's enough information for me to go on. I have a PR-3 connected to the layout and the layout programming track, but I can rarely get it to work properly (always a Java malfunction) so I switched to the Sprog for hassle free bench-top programming and generally don't program using the layout programming track. I don't have sound decoders (this is my first) so using the Sprog hasn't been an issue.
The layout uses a DCS 100 and DB 150, so there's plenty of power available to the programming track. Ok. I'll try that and see how it goes.
Thanks. Joel