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We use audio units for recording. It's a lot of code and I cannot share it. Project has audio background mode capability. I have used iPadOS 13.1 beta (I hope that iOS 13.1 beta is the same). If the application (on iOS 12.4) is in the background and something interrupts the app during recording (alarm, phone call) then it cannot resume recording (AudioOutputUnitStart failed with error AVAudioSessionErrorCodeCannotStartRecording). When I tested it on iPadOS 13.1 beta then it worked. I didn't try with AVAudioRecorder.