Amazing app for dueling. Would be 5 but....

First of all let me say amazing app! Works perfectly and no glitches. Only itch Ive got is that there is no way to play music while using the app. Is there a way to turn off sound that Im just not finding? If its possible to turn off and sound properly play music than Id give it a perfect 5 out of 5

Moses1928 about Duel Deck, v1.9