3D Audio TGB

I'm attempting to create some sound effects that have a volume that changes relative to the distance between the source of the sound and the camera. So that it fades the farther away you get from the source. I thought that the "is3D" variable in my audio description would handle that, but it does not seem to be working.

Does anyone know if this is suppose to work? Or am I doing something wrong?

P.S. When I call alxPlay I also pass in the position that I want the sound to originate from. It takes an x,y,and z coordinate so I pass the x and y but leave the z at 0.

Any help would be appreciated!

Thanks