As a service to you - in case you didn't know: All youtube videos are integrated into the www.roland-arranger.com website. This means that you don't have to find all Roland arranger keyboard videos by searching at youtube. Instead you just click here:
http://roland-arranger.com/index.php?option=com_content&task=category§ionid=7&id=35&Itemid=106

and voila! You see a list of all published yotube videos featuring roland-arrangers