Can an EZ-App loco, be controlled by DCC? Or is it a "Smart Phone" app required only, program?
An E-Z App loco cannot be controlled by DCC.
Power
An E-Z App equipped locomotive requires either 16 volts DC or DCC track power but does not use DCC commands.
Control
For E-Z App locomotive control the Bachmann E-Z App, which has preset settings; or the BlueRail Trains App is required on a touch screen smart device running Apple IOS or Android supporting Bluetooth Smart also known as Bluetooth Low Energy.
"For E-Z App locomotive control the Bachmann E-Z App, which has preset settings"
What the heck are you trying to say?
bUCKS, use the EZ-App app.