If it is brand new, Hornby brand and DCC fitted then it will most likely be fitted with an HM7000 decoder. They are configured for normal DCC operation out of the box. So yes, you should be able to use it with your existing DCC controller, but sound files can only be installed via the App, though it does come with a default steam sound, (which may well be out of date). In a nut shell, if you need to change the sound file you will have to do it via the App then switch back to DCC operation.