Also, you specifically asked about Wifi and the DCS app (WIU+TIU+smart device with app). https://mthtrains.com/sites/de...ction/20as13831i.pdf
It's basically the same thing as configuration and details with the DCS remote, just there is the "TRACK" tab or screen of the app to control a variable channel in conventional mode with slider, Bell, Whistle/Horn, and Direction buttons.
So page 47