Real Police Siren & Lights

So I got this app and bought the extra pack or whatever a few months ago, and I like the app, the lights work well and all, but just recently, my sound hasn’t been working. Everything else works but when I play any siren it doesn’t make any sound. I have my volume and sound effects all the way up on my iPad, but still nothing. Can you please tell me what’s wrong? If you get back to me and can get the sound fixed than I will definitely increase my rating of the app. Thanks!

I downloaded this app just to see how well it worked in the dark. Even having it for after 15 minutes, I try to delete it, but it won't delete. It shows that it's stuck on some sort of installation process, but it will never install anything. That needs to be fixed because it's killing me that it's still on my phone.

Sometimes me and my friend turn the lights on both our iphones and put our phones in the corner of my car window so we can pass people faster at night. People actually pull over. (Helps if brightness is all the way up)