public MainWindow()
        {
            InitializeComponent();
            Icon = Main.TheApplication.Current.ApplicationIcon;
            SetupHelp(KeyboardLayout.Create(this));
            radioIsWickiHayden.Checked   += (sender, eventArgs) => { KeyboardLayout.Instance.PopulateTones(true); };
            radioIsWickiHayden.Unchecked += (sender, eventArgs) => { KeyboardLayout.Instance.PopulateTones(false); };
            radioIsWickiHayden.IsChecked  = true;
            PopulateInstruments();
            SetupSliders();
            var presetsResetAction = SetupChordPresets(SetupChords());

            buttonResetAll.Click += (sender, evenArgs) => { ResetAll(presetsResetAction); };
            SetupVisualization();
            int maxKey = (int)(int)KeyboardLayout.Instance.MaxKey + 1;

            keyStates     = new BitArray(maxKey, false);
            this.KeyDown += (sender, evenArgs) => {
                KeyboardElement ke = KeyboardLayout.Instance.FindKeyboardElementByKey(evenArgs.Key);
                if (ke != null)
                {
                    if ((int)evenArgs.Key > maxKey)
                    {
                        return;
                    }
                    if (keyStates[(int)evenArgs.Key])
                    {
                        evenArgs.Handled = true;
                        return;
                    }                     //if
                    keyStates[(int)evenArgs.Key] = true;
                    byte velocity;
                    if (Keyboard.IsKeyDown(Key.LeftShift))
                    {
                        velocity = (byte)this.sliderOnPedalVelocity.Value;
                    }
                    else
                    {
                        velocity = (byte)this.sliderOnVelocity.Value;
                    }
                    var chordToUse = KeyboardLayout.Instance.CurrentChord;
                    if (!Keyboard.IsKeyDown(Key.LeftCtrl))
                    {
                        chordToUse = null;
                    }
                    byte volume = (byte)this.sliderOnVelocity.Value;
                    if (Keyboard.IsKeyDown(Key.LeftShift))
                    {
                        volume = (byte)this.sliderOnPedalVelocity.Value;
                    }
                    ke.Activate(true, chordToUse, volume);
                    evenArgs.Handled = true;
                }          //if
            };             //this.KeyDown
            this.KeyUp += (sender, evenArgs) => {
                if ((int)evenArgs.Key > maxKey)
                {
                    return;
                }
                keyStates[(int)evenArgs.Key] = false;
                KeyboardElement ke = KeyboardLayout.Instance.FindKeyboardElementByKey(evenArgs.Key);
                if (ke != null)
                {
                    ke.Activate(false, null, api.maxVelocity);
                    evenArgs.Handled = true;
                }          //if
            };             //this.KeyDown
            this.PreviewKeyDown += (sender, evenArgs) => {
                Key key = evenArgs.SystemKey;
                if (key == Key.None)
                {
                    return;
                }
                string       keyString = key.ToString();
                ToggleButton option;
                if (!chordAlternateKey.TryGetValue(keyString, out option))
                {
                    return;
                }
                var      wasChecked = option.IsChecked;
                CheckBox cb         = option as CheckBox;
                if (cb != null)
                {
                    option.IsChecked = !wasChecked;
                }
                else
                {
                    option.IsChecked = true;
                }
            };    //this.PreviewKeyDown
            Persistence.RestoreState(this);
        }         //MainWindow