If you right-click on the chordsheet and then select "Chord Builder", you will see all the chords available to BIAB in the dropdown box (see image below).

I'm not sure if the Mac version has this chord, but it's worth trying.

C7b9b13

As mentioned in my other post...

http://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=482847#Post482847

...it's very important that you disable "Natural Arrangements" and activate "Force simple arrangement" to get BIAB to play the chords that you enter. If you don't change those two settings, BIAB can potentially substitute some other chord instead of the one you want.

Regards,
Noel

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MY SONGS...
Audiophile BIAB 2024