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Hi, I have an app that has been developed with AudioUnit RemoteIO with renderCallbacks. The app has been performing fine, except on iOS 17 with devices like iPhone 14 or iPhone 15. On iPhone 14, the same app (a metronomic device) was performing fine with iOS 16, and when the customer updated to iOS 17, suddenly the audio was glitchy, had ghost sounds and sound artifacts. This does not happen on iPhone 11 Pro with iOS 17 (works fine!). However, I have been able to reproduce it on iPhone 15 Pro with iOS 17. It works ok at lower BPM and when the BPM goes over a certain threshold, the audio starts getting glitchy. The audio buffers are precomputed, so the render callback is relatively straightforward. Has anyone else seen this kind of issue on iPhone 14/iPhone 15 running iOS 17? I'm following up with Apple on this, but thought I would see if others are facing similar issues with their apps. Thanks, Sridhar

My audio app (a metronome) has Inter-App Audio support. When the app is launched, and I go to GarageBand and add it as an Inter-App Audio App, the connections are made and everything is good.On the other hand, if the app is not running, and I go to GarageBand and add it as an Inter-App Audio App, GarageBand launches the app and and the connection is made (it claims successfully), but when I click on my app icon to go to my launched app, it cannot produce any sounds at all.I looked at the console logs, and found that AUGraphInitialize fails with AVAudioSessionErrorCodeCannotStartPlaying in this case.default 21:39:39.467564 -0700 Talanome AudioController::publishAsNodedefault 21:39:39.468915 -0700 Talanome AudioController::addAudioUnitPropertyListenerdefault 21:39:39.468968 -0700 Talanome AudioController::initializeAudio: calling AUGraphInitializeerror 21:39:39.475786 -0700 Talanome AURemoteIO.cpp:1086:Initialize: failed: 561015905 (enable 2, outf< 2 ch, 44100 Hz, Int16, inter> inf< 2 ch, 0 Hz, Float32, non-inter>)error 21:39:39.478269 -0700 Talanome AURemoteIO.cpp:1086:Initialize: failed: 561015905 (enable 2, outf< 2 ch, 44100 Hz, Int16, inter> inf< 2 ch, 0 Hz, Float32, non-inter>)error 21:39:39.478312 -0700 Talanome ca_require_noerr: [result = destInfo->Initialize (this), 561015905] (goto gohome;)default 21:39:39.478352 -0700 Talanome AUGraphInitialize returned 561015905THis is what the console log looks like in the first case (when the app is launched first, and then connected to GarageBand):default 21:42:03.817179 -0700 Talanome AudioController::initializeAudiodefault 21:42:03.833656 -0700 Talanome AURemoteIO.cpp:434:AURemoteIO: AURemoteIO0x15686f240: reporterID=128849018949error 21:42:03.833919 -0700 Talanome ca_require: SanityCheck(newDesc) InvalidFormatdefault 21:42:03.833969 -0700 Talanome AudioUnitSetProperty returned -10868 for sampleRatedefault 21:42:03.834093 -0700 Talanome AudioController::publishAsNodedefault 21:42:03.835796 -0700 Talanome AudioController::addAudioUnitPropertyListenerdefault 21:42:03.835953 -0700 Talanome AudioController::initializeAudio: calling AUGraphInitializeNo Error messages were printed, which meant it finished successfully in this case.The error massage AVAudioSessionErrorCodeCannotStartPlaying (561015905 ) says "This error type can occur if the app’s Information property list does not permit audio use, or if the app is in the background and using a category which does not allow background audio.Clearly, my plist is ok and the category is ok too, because the app works fine if launched first. I'm wondering what might be occuring differently when the app is launched from within GarageBand and connected - from the console log, up to that point, it looks pretty much the same! Any help or pointers would be appreciated!Thanks,Sridhar