I have my carputer hooked up and the sound is using an audigy2 nx. I am happy with the sound going directly through the amps, but want to control with my factory HU. I have looked at every AUX-IN system, PAC, Pie, Peripheral, etc. and none of them will work - because I have this or that, etc. I am leaning towards an FM Modulator... but hear horror stories. I have seen the AAI-GM24 by PAC - and was wondering if anyone has used it? I have the bose system, 6 disc in dash cd, xm (not hooked up), onstar. Any input is greatly appreciated

http://www.pac-audio.com/products/aai.htm