Try an app called Tunity. It allows you to listen to a TV through your phone. I have worked in OTB's where we used the next up race as the decider for what feed to have the sound on but some folks preferred to listen to another feed and I would let them know about this app. I suggest using headphones when you use it so you don't bother others around you. Also good for getting the sound on a football or other sporting event when it is showing at an OTB.
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