It works !
For Semify DCC-EX Motor Shield
After modifying the MotorsDrivers .h file in dev version
#define EX8874_SHIELD F("EX8874"), \
new MotorDriver( 3, 12, UNUSED_PIN, 9, A0, 4.86, 5000, A4), \
new MotorDriver(11, 13, UNUSED_PIN, 8, A1, 4.86, 5000, A5)
Very cool!
