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Although a bit late, butfunc saveAVSpeechUtteranceToFile(utterance: AVSpeechUtterance, fileURL: URL) throws { let synthesizer = AVSpeechSynthesizer() var output: AVAudioFile? Logger.shared.debug("Saving region utterance to file: \(fileURL.absoluteString)") try? FileManager.default.removeItem(at: fileURL) synthesizer.write(utterance) { buffer in guard let pcmBuffer = buffer as? AVAudioPCMBuffer else { Logger.shared.error("unknow buffer type: \(buffer)") return } if pcmBuffer.frameLength == 0 { // no length }else{ if output == nil { output = try! AVAudioFile(forWriting: fileURL, settings: pcmBuffer.format.settings, commonFormat: .pcmFormatInt16, interleaved: false) } try! output!.write(from: pcmBuffer) } } }This came from https://stackoverflow.com/questions/25965601/avspeechsynthesizer-output-as-file