Apple Logic Pro /LogicExpress Discussion

I have just bought an Edirol FA101. I use Logic Pro 8, Macbook Pro,
Leopard. It works fine, except that I cannot control the input and
output levels separately. 

The main problem is only when trying to record and monitor at the same
time. The FA101 has a volume control that allows one to alter either
monitor or all the input levsls relative to each other but allows no
relative mixing of the inputs nor control of the overall volume. This
seems a pretty basic requirement. I cannot monitor through logic
because of the latency (or could I - if I knew the right settings?).

Can anyone help? I cannot find anything on the Edirol web site or
through a general Google search.

Thank you for your help ...
Mike