well my sound has been working fine until the past few days. i would be listening to songs, and a certain insturment would drain out and i can't hear it. however i can hear all other instruments perfectly. for example the song revolution by the beatles, i could hear only the vocals and the drums perfectly, but the guitar and bass are really faint. this happens on many other songs too. also when i record the song using the "what you hear" feature, on AIM's recording feature, and then play it back, i can hear all the instruments fine.