I really like the new MTH app. My fleet is about 80% TMCC. I have every variation. Legacy, EOB, ERR and K-Line. I've been trying them out with the new app. Love how Legacy performs. I have 3 K-Line steamers. All setup in 128 step mode. They run very well with the DCS remote. Tried them with the WIFI. They start up and run fine. Except I can't get them to reverse. The backup light goes on. But the engine stays in forward. Odd thing. With the remote. They only respond to the thumb wheel if it's in 128 step mode. In 32 they just sit there. Running with Wifi. There is no option for 128. Although they run forward fine. I've tried 32, default, EOB and Relative. All with the same result. Even tried locking it in reverse in the app. . These engines from what I remember running with Cab 1 had a quirk. When you hit the direction button. They engine would come to somewhat of a stop. Then proceed in the opposite direction without touching the throttle.
Certainly not a deal breaker. Probably not to many out there running K-Line with MTH products. The K-Line boards are probably on borrowed time anyway. The app works well with the ERR board.