Hello, thanks for your answer. Bug report opened FB16028541 If needed I think we could provide source code or provide a test application to reproduce but this cannot be public so we need to be contacted directly. If needed we alos had a case opened Case-ID: 3653994 Regards

Apparently audioFileSettings is filled inside AVSpeechSynthesisProviderVoice automatically because on iOS 17 these information is well present on AVSpeechSynthesisVoice.audioFileSettings without doing anything AVSpeechSynthesisProviderVoice side. But on iOS 18.x it comes back empty @State private var voices: [AVSpeechSynthesisVoice] = [] List(voices.sorted(by: { $0.name < $1.name }), id: \.identifier) { voice in print(voice.audioFileSettings) } iOS 17.4 ["AVNumberOfChannelsKey": 1, "AVLinearPCMIsFloatKey": 1, "AVSampleRateKey": 22050, "AVLinearPCMIsBigEndianKey": 0, "AVLinearPCMBitDepthKey": 32, "AVLinearPCMIsNonInterleaved": 1, "AVFormatIDKey": 1819304813] iOS 18.3.1 / 18.4 [:]

Hello, the issue seems to have been fixed by Apple on iOs 18.6 beta. Will re-check once 18.6 final will be released

Hello, the issue seems to have been fixed by Apple on iOS 18.6 beta. Will re-check once 18.6 final will be released