Pidgin NoSound Solution

For some reason, Pidgin, do give a sound output to your computer even though the sound card and drivers works perfectly.

the best solution for that is do the following.

1. In Pidgin, select Preferences from the Tools menu (or simply press Ctrl+P)
2. Click on the Sounds tab
3. In the Method drop down list, select Command
4. In the Sound command text box, enter the following: aplay %s
5. Select an event with an assigned sound from the Sound Events list
6. Click the Test button. You should now hear the notification sound
   
7. Click the Close button.

many thanks for Peter Ridge for the guide ^_^