My friend lent me an audio4 plus. I installed iconfigAudio on an air 1 running iOS 12. Many problems trying to connect.
I think I may have found a workaround.
I tried connecting after a shutdown/reboot. Unreliable. Either...no devices found or.....communication lost.
But....booting up, then, once booted, hold down the shut off button until the swipe screen comes up...then hold home button down until home screen appears. Launch iconfig audio. Rock and roll!
I had almost given up on editing routing on iOS. Not no mo!
I'm entirely blown away at the functionality, innovation, value and sound of this device!
Hope this workaround works for all.