Is there a way I can use 2 iPads in a concert with one video taping the conductor and the other sitting on a church organ acting as an instant sight line - have considered FaceTime but there is a time delay.
You will need something that uses the local wi-fi, and it needs to be a fast wi-fi network. The Camera-A and Camera-B apps might do what you want. The Camera-B app is for the iPhone, but will work on the iPad in emulation mode. You need both. The delay may still be too much, but it's worth a try. There is also at least one baby monitor app out there that should work. I don't remember it's name, but a search should turn it up.