I am working on an app that uses Core Audio through JUCE library for audio. The problem I'm trying to solve is that when the app is using a full duplex audio interface such as one from Focusrite Scarlett series for output, the app shows a dialog requesting permission to use microphone. The root cause of the issue is that by default, Core Audio opens full duplex devices for both input and output. On previous macOS versions, I was able to work around the problem by disabling the input stream before starting the IOProc by setting AudioHardwareIOProcStreamUsage to all zero for input. On macOS Sonoma this disables input so that the microphone indicator is not shown, but the permission popup is still shown. What other reasons there are to show the popup? I have noticed that Chrome and Slack have the same problem that they show the microphone popup when trying to play sounds on the Focusrite, but for example Deezer manages without the popup.

I'm developing an iOS application that uses Core Audio. When I'm running the app on Silicon Macbook, the first time I call AudioUnitSetProperty the following error is logged: CARP violation: using HAL semantics (AUIOImpl_Base) Are others getting this, and is this part of normal process? I'm also getting AQMEIO_HAL.cpp:862 kAudioDevicePropertyMute returned err 2003332927 when I set kAudioOutputUnitProperty_EnableIO for input.