I gave up a long time ago trying to eliminate latency from my keyboard when using BIAB and a soft synth. My keyboard line out goes to the mixer in parallel with the line out from a MIDI sound module (currently a SD50) which is driven by BIAB, and another line out from the computer to the mixer for real tracks. This works perfectly with no MME/ASIO issues to worry about.
Tony
Thanks for the response about your set-up, Tony. I'm not sure whether that type of set-up would work for me though.
If I understand your configuration correctly - your keyboard is not connected to your laptop at all? If that's the case, while it would work for mixing the BIAB output and keyboard output, I wouldn't be able to use Pianoteq (alone) without reconfiguring some cables. (Pianoteq requires that the MIDI controller is connected to the laptop.)
Thanks.