Boy I love a happy ending and I got one........ the sound issue is resolved on my atlantic loco!!!!!
I used cc-m kit and it didn't come with new r4lc board.
I was searching on google and found a yearish old link to none other than OGR... same issue I had and same solution.
On older TMCC locos when doing a Cruise Commander modular conversion you must update to the R4LC board to get sounds to function.
The CCM package doesn't include a R4LC board so order one when you order your kit.
Have a Happy New Year and thanks for all the help sorting this out.
I hope this helps someone on their CCM install.
I'm off to enjoy my noisy atlantic!!!
Dave