Trying to enter a"Abadd2 (no3)" in BIAB. I attempted writing as Ebsus/ab but the instruments seem to be confused by that. Any ideas.

Try Absus2.

Ab2.

They are all the same to BIAB. pgshortc.txt

Absus2 did the trick. I would have never thought of that because it puts a Db in the voicing but it works.

That's because it's not a true sus2; it's really an add9 (which is the same as the 2, but an octave up). So you may (depending on the style or the RealTrack artist) end up with the 3 there anyway (the Db), but you still get the tension of the 9 (or the 2, if you will).

Here's how BIAB treats these. I've included some of the built-in shortcuts, as shown in the file, /BB/Data/pgshortc.txt

Note these are already defined in BB, and you can't over-ride these shortcuts
;sus2@2 add2@2 m+@m#5 dim7@dim 7aug@7+ sus4@sus 11@9sus 9sus4@9sus
;13sus4@13sus add9@2 7sus4@7sus s@7sus h@m7b5 d@dim J@MAJ7

Note: sus2 means 2, add2 means 2 and add9 means 2. They all map to the same chord.

Using "sus" will add a Db to your chord. Type in your original chord without "(no 3rd)". Abadd2