External mic with iPhone and Bluetooth output I need some way to control iPhone 5 to allow me use a external microphone in the headphone 3,5mm socket and output my voice (in real time) to an external bluetooth speaker via the mobile Bluetooth system in the phone. In fact it’s like using a mobile phone as a PA system. Can anyone help?
I found this app on App store that might suits your needs.


  Megaphone transforms your iPhone into an instant Microphone, PA system
  or Megaphone when you plug it into amplified speakers.


https://itunes.apple.com/us/app/megaphone-free/id304955183?mt=8

As you plug in external microphone your system should switch to that input, same for the Bluetooth speakers as output.