Quote:

...DSus4 would mean drop (suspend) the 5th and play a 4th, ...


I believe in both cases (Dsus2 and Dsus4), the 3rd is always dropped (not the 5th).

Quote:

One is Cadd9 and on input I get Cadd2.


Since the "D" is the 2nd and the 9th in a C major scale, I guess you could say they are the same (even if they are not --ha, ha). But it seems that in BIAB, this is the best you can do.



Now at bandcamp: Crows Say Vee-Eh @ bandcamp or soundcloud: Kevin @ soundcloud