ce the default view with a custom view.
    setView(new ControllerView() {
      public void display(PGraphics p, Object b) {
        // draw button background
        na += (a-na) * 0.1; 
        p.fill(current,na);
        p.rect(0, 0, getWidth(), getHeight());
        
        // draw horizontal line which can be moved on the x-axis 
        // using the scroll wheel. 
        p.fill(0,255,0);
        p.rect(0,y,width,10);
        
        // draw the custom label 
        p.fill(128);
        translate(