Logic Pro 8 Problems with tascam interface

[BMNIKL]

I am using a tascam us-1641 interface with logic express 8. my problem is that audio is gettin picked up by the interface but not in logic. the input is set to us-1641 and i have the "i" button clicked on but nothing. what do i need to do here? with cubase the interface works fine, audio is picked up normally but in logic its simply does not recognize any input.

thanks