BTW I couldn't even assign a TMCC engine to 99. Interesting.
Yep: I programmed the Station Sounds diner car with ID #99 and it works fine. But the velocity dial on the Cab 2 only SLOWS DOWN the T1 no matter which way I turn the dial. So to run the T1, I hit the SPEED button and select one of the pre-set speed icons to make it run. But when I turn the throttle, the speed slows down either way I turn it. Very bizarre.
The T1 settings are: STEAM ENGINE / TMCC / RAILSOUNDS. I also tried running it in Cab 1 mode.
I didn't have time last night to test the Lionmaster Legacy Big Boy and today I have to work. I will try it tonight. I will also reprogram the South Wind stationsounds passenger car to a different ID #.
I will report tonight when I get home (after dinner).
Thanks for all of the advice. I just hope my Legacy 990 system isn't a lemon.