More research done and found this:
http://i.imgur.com/hKFSVgy.jpg
So not only telling us where the reverse trigger wire is, but if you look at the bottom left 3 pins, you have the AUX left, ground, and Right pins, I think my right or left is in the ground position, so that should fix my audio problem as well.
Another thing about the reverse trigger wire, it's 12v, so I'm thinking I can use that for not just the "Back" wire going into the Ca-Fi, but also the power wire going to the camera. I will try this and let you know how it goes!
Edit: I just remembered my Rydeen Duo only requires 6v, so I guess can tap into the CA+ pin to on the 16-pin harness in that picture. If anyone else has any suggestions feel free to chime in, I'm just wingin' it right now :P