Error code on iOS

If you see "your microphone failed to start" and get an error ae714 or ae702 in GuitarTuna, try the following for troubleshooting:

1. Delete GuitarTuna. 
2. Log out of the Apple ID account used. 
3. Reboot the device. 
4. Log back in to Apple ID used. 
5. Reinstall GuitarTuna from the App Store.