Good afternoon and thank you for posting on the Final Fantasy XIV Technical Support Forums.

Final Fantasy XIV is designed to use the default audio device, so it would make sense that it would ignore an app like this. If you want to change the audio device that the game uses, you will have to change the default audio device. additionally, the app is pretty new and the game was never designed with it in mind.

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!