Dave,
The MacPro (mine anyway) seems to have two different 1/8" TRS unbalanced audio output jack, one on the front, one on the back.
Either one will do, but you have to assign it within FCP and the Mac audio system panel. It took me a bit of trial and effort to figure that out, but it works.
I use a Mackie Big Knob in between my MacPro and power amp. It lets me run my CD player turntable and other sources including my Mac through the monitor system. Not necessarily some you have to do, but perhaps something that might come in handy.
Regards,
Ty Ford
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