Is there an app out there that will allow you to use your iPhone's mic to broadcast live signal through AirPlay speakers? We have parties and gatherings at the house and I'd love to be able to use my iPhone for public address through my AirPlay enabled outside speakers. It seems like a simple enough app, so I'm surprised someone hasn't done it yet, though I'm not familiar with the limitations put on AirPlay in the SDK. So, if there's an app out there that does this, can someone point me in the right direction? Thanks a bunch!