Hey Fellas, my mac pro has been playing up for the past couple of weeks. Namely I cannot control he volume of my external speakers using the volume controls for the computer. There was a time when a SMU reset would fix the problem but not any more. Line Out is selected as the source for sound output. When i try to change the volume the user interface sound comes from the internal speaker. It seems that the volume control in the menu bar is only controlling the internal speakers and I cant seem to change it!!! Is this something anyone has heard of before and is there a fix that you know of?