Firewire 800 to 400 cable MacBook Pro Final Scratch 2 FS2

I just bought a firewire 800 to firewire 400 conversion cable so I could use my new MacBook Pro with my old Final Scratch 2.0 box, and when I plug it in nothing appears in the audio config options.
I have used the FS2 with a fire400 cable on Leopard just fine, but this is Snow Leopard with a fire800 port. All of the options are the same. This should be plug n play just like it has been for my mac mini G4 and intel chip workhorses.
The FS box lights up the left-most led for a blink when I plug the cable in, so it is getting bus power...
Any thoughts?
I have used the FS2 with a fire400 cable on Leopard just fine, but this is Snow Leopard with a fire800 port. All of the options are the same. This should be plug n play just like it has been for my mac mini G4 and intel chip workhorses.
The FS box lights up the left-most led for a blink when I plug the cable in, so it is getting bus power...
Any thoughts?