Hi,
I'm a bit upset: Why should it be impossible? Although Biab is not a dedicated recording software, it wasn't too difficut for me to get recorded the sounds I wanted in Biab. There is one important limitation: Biab has only one track for audio recordings. So I switch to RealBand if I want to have two or more audio tracks to record on. But may be I still don't understand your specific issue. First: You want to record the sound provided by the Nord, am I right? Then the problem is the routing of the intruments line out to Biab via the Saffire. Let's say the Nord is connected to input 5. If I select channel 5 as the ASIO input I can easily record my keyboard. It's a bit unvenient to change the audio driver to switch back to the microphone, but it works for me.
Second: Or do you want to record the sound provided by the standalone software? Then the same computer has to produce the sounds and to record them. I assume that it must be possible with your Saffire; I tested it this today for the first time with the LoungeLizard e-piano and it worked.
May be we can figure out the issue; I hope so.
Ok, I would like to have some improvements in recording within BiaB, too. But if I want to record one single track, there was always a way.
Regards
Wolfgang

Core2 Quad, 2.33 GHz, 4GB, Win 7 Ult., onboard
P4, 3.0 GHz, 3 GB, WinXP, focusrite saffire 24 DSP