Posted on 
May 12, 2008 10:08 pm Well I don't use the Fireface and Cubase either. But it should be something along these lines.
Go to your audio preferences or options and make sure and select the ASIO drivers for the fireface unit. Make certain if they are listed as separate channel's to highlite each one that pertains to ASIO channels of the fireface interface.
Then they should become available in your track view when you select an audio track and set its input and output properties.
If you are going to record more then one track at a time then simply set up each audio track with a different input channel of the fireface.