Oh that's awesome, the world is really small!! I wish to see your project!! Thanks for your tip I will take it in account. Here I wanted to create the simplest program possible just to experiment with sound and to have fun :) I also tried to create a mini amplifier to get a better and load sound, using some transistor but was easy at all. I managed just to raise the volume but I got a distorced noisy sound. Maybe one day I will take inspiration from some existing circuit.
Bye bye thanks for your support...have a good day :)