thanks Noel
yes its unusual and not a chord by definition just to have the two notes but chosen specifically to get the sound just the two make without the other notes. Only done in very rare places which respond to the lyrics going sour then returning to bright happy sounds.
It's great to have this clarification that its not possible in BIAB. I'll just have to write the full chord with 3 notes then write over it in Logic Pro with my own two notes louder to get the effect... I think that will work. I'm not doing it in all my songs but the current one I'm working on requires it in a few targeted places.
thanks for the info much much appreciated
Cheers
Atlantis
https://soundcloud.com/atlantisz