Thank you for reaching out to us on our forum. I am sorry to hear that you are not able to hear any audio from your SlingPlayer app on your iPad. I have a quick question for you, do you get audio on your computer when you go to watch or does this problem only exist on your iPad? I also found a helpful article from our support website with some troubleshooting steps you can try. I will post the link below for you.
Hope this helps,
The Slingbox Moderation Team