Hi Larry. First, the standard for chord notation is not absolute.

Second, BIAB has a few of its own conventions.

Third, the version of BIAB will determine the correct answer in a few cases.

In version 2016, you can enter Gdim7. I just did it. In older versions, when you enter a diminished chord like Gdim you will hear a Gdim7 chord in most styles but it displays as Gdim.

I can't think of any reason to enter b11. That's enharmonically the same as a major third. Can you give me an example? Or did you mean #11? You can enter G9#11 but not G7#11 in BIAB (I've put that on the wishlist).

A7sus4 should enter fine, but display and play as A7sus. If you have version 2016, you can control this. Do Preferences, Display. You will see a checkbox to Display sus as sus4.

The most helpful thing you can do is right-click on a blank cell in the Chordsheet and select Chord Builder. Then look at all the supported chord types in the pull-down area marked Other.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.