Here's a link to a page with all the pinouts for the Audigy cards, including the internal firewire connector:
http://dmzweb4.europe.creative.com/SRVS/CGI-BIN/WEBCGI.EXE/,/?St=27,E=0000000000024081212,K=6896,Sxi=8,Case=obj(15530),VARSET=centric:280,Kb=creative_cli_en
I got this same info from...