Thanks a lot, i re-made the wiring and i realized that there are only 1*10^6 horrible solder joints . Now the boost ,boosts!I've only one mistake, the stereo jack connector has the ring clip opened, when i plug the jack in, the clip cover it, but if i let the jack in "the middle" signal passes...i've to bend the clip? In the first image is the right clip
http://www.musikding.de/popup_image.php/pID/166/imgID/0