Thanks for the report back kirk, good to know it's working. Not sure what you've done though -- I thought you said you were just tying together 2x 9v DVD batteries to get 18v. As I recall, several people tried that before and couldn't get it to work.
Looking more closely at the pics of your cable though, it looks like you've got a voltage regulator buried in there (to get to 12v I guess). Maybe it is this configuration that is making it work for you when it failed for others?
BTW, if that is what you've done, and are dropping 18v down to 12v for use with the Apogee, I'd be a bit worried about heat dissipation. I think the AD1000 draws something like 1.2 Amps, and you're dropping 6v. That's 7.2 Watts of power that needs to be dissipated as heat.