The Kona 2 has eight channels of AES and/or embedded digital out (5.1 only requires six). Unfortunately, you may find the tools in FCP lacking for a professional 5.1 audio mix. You could consider using an audio specific program like
MOTU Digital Performer 4.5 to handle the audio mix after you've completed primary picture edit. You also might want to consider a dedicated piece of audio hardware like the MOTU 828mkII which connects to the computer via 1394 firewire (no PCI slot required).
Bart
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Bart Harrison
MPA - The HD Suite
America's VAR
TurnKey Editing Systems, Storage Area Networks
HD Consulting, Production & Post, Exhibition & Distribution
http://www.hdsuite.com
954-894-1221