 
 class ViewController: UIViewController {
 
+    let SeekTimeStep = 10.0
+    
     var timer: NSTimer?
     
     var audioPlayer: AudioPlayer?

        playing = !playing
    }
    
    @objc func fire(sender: AnyObject) {
        
        updateMediaSlider(currentTime: _currentTime)
    }

    }
    
    @IBAction func backTapped(sender: UIButton) {
        let newTime = _currentTime - SeekTimeStep > 0 ? _currentTime - SeekTimeStep : 0
        updatePlayer(currentTime: newTime)
    }

    @IBAction func forwardTapped(sender: UIButton) {
        let newTime = _currentTime + SeekTimeStep < _totalTime ? _currentTime + SeekTimeStep : 0
        updatePlayer(currentTime: newTime)
    }
    
