i noticed that when i change the volume with the f11 and f12 keys i used to get little blips, but now theyve gone. i think i turned them off somewhere, but i want them back again, but i cant remember where i did it 
anyone any ideas? i checked the 'sound' options in system pref but im blind if its there
anyone any ideas? i checked the 'sound' options in system pref but im blind if its there