Thank yo ufor your answers.I don't want to buy anything, because I don't have any money^^. I don't have any job I'm still to school.But, the MP3 hacking is interesting me. I'd like to do it with mine, wich is 4 go. But the jack connector is dead. I removed it and now I have 4 connecting on the motherboard. How can I connect a speaker to that? Because a speaker only has 2 connecting?Then, to connect it and control it with the Arduino board, it looks easy.