Did I do it? YES! I did!!!!
Thanks to Bee, who is always on alert, just as the rest of the coordinating team. (thanks Aaron, I haven´t thought about that...)
I signed up for a free account in a server, uploaded the voice file and managed to past the HTML code correctly! I still can´t believe it worked!
Thanks everybody for this wonderfull learning experience that teaches us much more than "ways of using Internet tools"... What follows is also amazing: