The reason that no one has answered is most likely that no one here has that same combination of equipment. With a little more info some one might be able to point you in the right direction.
For instance, I'm not familiar with the Fostex, does it have aux sends or an effects loop? How about channel inserts ?
Do you want to use the compressor during recording or mix down? For the whole mix or just part of it?
What are you mixing down to?
With this info someone can probably help.