I have a 12'' pb running 10.4.5 and i recently downloaded the update to itunes. i have my computer running to my stereo and have never had a problem with the sound quality. since i have downloaded itunes, i have noticed that the volume has been significantly decreased and the sound quality is very poor when playing songs in itunes. playing them in other players such as quicktime or mplayer2 plays them at the normal level. in itunes i have to turn my stereo up past half way to get what i used to hear at a quarter turn of the dial. is there anything i can do to fix this. i certainly do not want to change music players.