From the "things you probably already know" department, not Wavelab or DAW related-
Try mixing and listening to the matrix both ways:
1) AUD microphone source primary, made better and supported as needed by the addition of SBD (clearer, closer, better balanced).
2) SBD source primary, brought to life and made 3-dimensional and real sounding with the addition of the AUD.
You'll likely reach somewhat different sounding mixes each way, and can then compare and choose the better of the two. Approaching it two different ways and comparing them can be rather enlightening.