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Hi,I have been trying to use the new method that writes a speech utterance to file:func write(AVSpeechUtterance, toBufferCallback: AVSpeechSynthesizer.BufferCallback)I have tried looking for examples on how to save audio that is return in the callback to file and so far I have done this.func setupAudioFile() { var filePath = containerUrl filePath?.appendPathComponent("save.wav", isDirectory: false) guard let file = try? AVAudioFile(forWriting: filePath!, settings: outputFormatSettings, commonFormat: .pcmFormatInt16, interleaved: true) else { print("unable to create new audio file") return } newAudio = file } func convertTextToSpeech(text: String) { let utterance = AVSpeechUtterance(string: text) utterance.voice = AVSpeechSynthesisVoice.speechVoices().first(where: { (voice) -> Bool in return voice.name.compare("Lee (Enhanced)") == .orderedSame }) let synthesis = AVSpeechSynthesizer() synthesis.write(utterance) { (buffer) in let audioB = buffer as! AVAudioPCMBuffer if self.audioBuffer == nil { // self.audioBuffer = AVAudioPCMBuffer(pcmFormat: AVAudioFormat(commonFormat: .pcmFormatInt16, sampleRate: 16000, channels: 1, interleaved: true)!, frameCapacity: AVAudioFrameCount(audioB.frameCapacity)) // self.result = Array(repeating: [Float](arrayLiteral: Float(audioB.frameCapacity)), count: 1) } if audioB.frameLength == 0 { print("Finished") } else { self.writeToFile(buffer: audioB) } } } private func writeToFile(buffer:AVAudioPCMBuffer) { let audioBuffer = buffer do { try self.newAudio?.write(from: audioBuffer) } catch let e { print(e.localizedDescription) } if audioBuffer.frameLength == 0 { print("Finished writting buffer") } }I think I need to be doing something like appending the buffer but I am not sure how to do this.Any help would be appreciated. Cheers.