I got mine working as well, the trick, I think was to copy in the ini file (changing the name) and let the config file generate it's own information based on the ini file (device id etc). I did set the number to 0 (full manual) for the controller, but it doesn't seem to matter as it changes back automatically once you launch a mupen64* emulator.
The controller will only work in mupen64 emulators though, so I may still return the adapter for something better. N64 is SOOOO much better with a real N64 controller though.
Not sure why this failed for me the first time, I think by taking in the cfg file I corrupted something.