It sounds like the DXi you are using may be a non-GM standard synth? You can use Realband the same as Biab when it comes to generating parts. Plus, you can assign a different DX/VST on each track in RB as well.

Open your song from Biab in RB, save it in Biab and open it in RB. It should also load the style you are using Biab. You can generate any Biab part in RB.

Trax