Is there an app that allows me to pair a couple of devices and use an iphone as a wireless microphone? So I pair the iphone with a Mac or iPad, and then use the iPhone as a wireless microphone. The iPad or Mac is just acting as a receiver and amplifier, and I plug it into an amplifier (e.g. stereo) to output the sound. This effectively should give me a miniature PA system with wireless microphone. It doesn't sound too hard, but I can't find any kind of app that does it. Anyone know of one?