I wonder if this is possible: to separate which sound comes out from where... I'm on SL 10.6.8, and I have external speakers connected to my 2009 iMac through the headphone jack in the back of the iMac. Problem: when I'm playing music through my external speakers, especially at a bit of a louder volume, I must be very careful with what I do on my iMac, because all the system sounds, such as emptying trash, come through my external speakers at huge volume, and it's quite jarring, not to mention interferes with the music. What I would like: is it possible to have iTunes, music, film and all media, such as playing youtube videos etc., come normally through my external speakers, and at the same time any systems sounds, such as emptying trash, come out through the regular iMac speakers? I can't find anything in Sound Systems Preferences, so either it's not possible, I'm not finding it, or there's something else that needs to be done. Thanks in advance!