I am an all Real Tracks user - mostly jazz stuff - and have never been able to get BiaB to generate a Cadd9 (CEGD). I have typically used C2 in its place, accepting that the resultant sound isn't exqctly what I wanted, e.g., with the D in the next higher octave. Since I just recently installed BiaB 2013, I just re-tried Cadd9 (which immediately changed to Cadd2 upon entry) with several differnt RealTracks piano tracks (#771, 1729, 1549, 1998 and 1610), and it generated neither 2nds or a 9ths. It generated all simple triads! So Cadd9 apparently doesn't work - at least not with RealTracks.