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I am trying to run two SFSpeechRecognizer simultaneously with different languages. So I tried the following: var speechRecognizer1: SFSpeechRecognizer? = SFSpeechRecognizer(locale: Locale(identifier: "en-GB")) var speechRecognizer2: SFSpeechRecognizer? = SFSpeechRecognizer(locale: Locale(identifier: "it-IT")) var speechAudioBufferRecognitionRequest = SFSpeechAudioBufferRecognitionRequest() var speechRecognitionTask1: SFSpeechRecognitionTask! var speechRecognitionTask2: SFSpeechRecognitionTask! ... let node = self.audioEngine.inputNode let recordingFormat = node.outputFormat(forBus: 0) node.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat, block: { (buffer, time) in self.speechAudioBufferRecognitionRequest.append(buffer) }) self.audioEngine.prepare() do { try audioEngine.start() } catch { print("Error") return } guard let myRecognition = SFSpeechRecognizer() else { print("Error") return } if(!myRecognition.isAvailable) { print("Error") return } self.speechRecognitionTask1 = self.speechRecognizer1?.recognitionTask(with: self.speechAudioBufferRecognitionRequest, resultHandler: { (response, error) in if(response != nil) { guard let response = response else { if let error = error { print("Error") return } else { print("Error") return } } var message = response.bestTranscription.formattedString }) self.speechRecognitionTask2 = self.speechRecognizer2?.recognitionTask(with: self.speechAudioBufferRecognitionRequest, resultHandler: { (response, error) in if(response != nil) { guard let response = response else { if let error = error { print("Error") return } else { print("Error") return } } var message = response.bestTranscription.formattedString }) This gave me the error: SFSpeechAudioBufferRecognitionRequest cannot be re-used So I tried to create two instances and initialized them by: self.speechAudioBufferRecognitionRequest1.append(buffer) self.speechAudioBufferRecognitionRequest2.append(buffer) }) But this also didn't work. There was no error, but one speechRecognition just overwrote the other... I tried some other stuff like changing the bus etc. but was not successful...