Having a bluetooth device such as a headset or in-car microphone attached will disable the iPhone or iPad's internal microphone. Bird songs will not be recorded correctly. If you are seeing a blank screen or having other similar issues, check to see if you have Bluetooth enabled on your device and try disabling it to see if the problem goes away.
Wildlife Acoustics, Inc.
3 Mill and Main Place, Suite 210
Maynard, MA 01754-2657 USA
+1 (978) 369-5225
+1 (888) 733-0200