My issue with that is that there is no analog card for that board that has 16 outs. They do on the digital cards. Plus, I believe that the 664 only takes 4 digital ins on 1,2, 5, & 6. So, those digital cards don't help me.
The reason for building this is to open the 8 eight analog outs from my current card to feed coms, IFBs, camera, and playback. Then, I can use this cable to get me 12 direct outs to feed to all the inputs of the 664. My max channel count on this show would probably be 10, but having two extra wouldn't hurt.