 
             case .rightArrow:
                 self.goForwardInTime(nil)
+                return nil
+ 
+            case .minus:
+                self.reduceSpeed()
+                return nil
+ 
+            case .plus:
+                self.increaseSpeed()
                 return nil
             }
         }

        case spaceBar = 49
        case leftArrow = 123
        case rightArrow = 124
    }

    private func startMonitoringKeyEvents() {

            playbackSpeed = playbackSpeed.next
        }
    }
    
    public func reduceSpeed() {
        for speed in PUIPlaybackSpeed.all {
            
        }
    }
    
    public func increaseSpeed() {
        for speed in PUIPlaybackSpeed.all {
        }
    }

    @IBAction public func addAnnotation(_ sender: NSView?) {
        guard let player = player else { return }
