save project

my_music.py

@@ -26,7 +26,8 @@ while True:
             if event.key == locals.K_DOWN:
                 volume=0.1
                 if volume<0:
-                    volume=0           
+                    volume=0 
+                pygame.mixer.music.set_volume(volume)           
     if pygame.mixer.music.get_busy() == False:
         pygame.mixer.music.play()