Bobby, thanks for more posts.
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POST 30:
Added coupler slack noise but wasn't working.
With the other MTH engines, I only had to select the soft keys and select 'more' and then click S2 to move the 'coupler slack' noise.
With the GN R-2, I was getting no 'coupler slack' noise when starting the engine throttle.
I also wasn't getting any smoke so I deleted the engine and re-added the engine.
That fixed the smoke but not the 'coupler slack'.
After 'playing around' with the remote for several minutes, I found that I had to increase 'engine sounds volume' under the menu key under sounds.
The volume was at zero. A simple scroll of the throttle wheel increased the volume.