         case spaceBar = 49
         case leftArrow = 123
         case rightArrow = 124
+        case minus = 27
+        case plus = 24
     }
 
     private func startMonitoringKeyEvents() {


            case .rightArrow:
                self.goForwardInTime(nil)
                return nil
            }
        }

            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 }
