Hello! I think it's enough with just one button. Great idea, but sorry... April 1 http://www.youtube.com/watch?v=1KhZKNZO8mQ&feature=youtu.be 73 de Jose -- Jose Miguel Femenia Herrero EA5DFV Pda. Cometes, 3/2 03750 PEDREGUER (Alicante) España.