         })
     }
 
-    @IBAction func next(sender: UIBarButtonItem) {
+    @IBAction private func next(sender: UIBarButtonItem) {
 
         guard let fileURL = voiceFileURL where !sampleValues.isEmpty else {
             return


    // MARK: - Actions

    @IBAction func cancel(sender: UIBarButtonItem) {

        dismissViewControllerAnimated(true, completion: { [weak self] in


        }
    }

    private var audioPlaying: Bool = false {
        willSet {
            if newValue != audioPlaying {
                if newValue {
