Hi ferran
 ... I suggest you reboot without any alsa or pulseaudio extensions set "onboot" or "ondemand", ... 
1. Click on the  Apps  icon.
2. Click  Apps->Maintenance->OnBoot Maintenance.
3. In the  On Boot Items  panel, click the item you wish to remove from your  onboot.lst  file.
4. Click the  Delete Item from List  button.
5. Repeat steps 3 and 4 as required.
6. Click  Apps->Maintenance->OnDemand Maintenance.
7. Remove all items.
8. Exit the  Apps  program.
9. Reboot your machine.
You can also use the  Apps->Maintenance->OnBoot Maintenance  page to add items back to your  onboot.lst  file.