Considering there are no pins on the board labelled "FP_Audio" or anything of the sort, what makes you certain it's possible? The Audigy boards are designed so that if you want front outputs and inputs, you need to have their higher-end models that come with the Platinum Drive. A few of the pins on the AD_EXT connector are possibly just audio connection pins, but if in fact the Drive is digitally communicating with the sound card then there aren't any analog pins for you to plug in.