Desktop Station hardware supports DCC28, DCC14, DCC128 speed steps.
DCC28 speed step is default. Normally you can run the locomotive in this mode.
Desktop Station supports DCC128. Desktop Staion 0.92f or later.
If you don't use DSGatewayLib R6E or later, please update your Arduino.
You can select speed step at the locomtoive editor on the Desktop Station.