Is there a way to have the sound output from both the built-in speaker as well as my line out speakers at the simultaneously on the Mac Pro? So far I've only been able to choose one or the other. Thanks! 
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Sound Output on Mac Pro
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You can have the system sounds go to one (built in speaker) while program sounds go to another (line out) but there doesn't seem to be a way to send all sounds to multiple outputs. The internal speaker is really only good for system sounds anyway (mono and cheep) so why would you want program sounds sent to it?