Are you referring to the dominant 7 (G note) or the natural 7 (G# note)? Assuming you're referring to the commonly used diminished with a flat 7 (dominant 7), use the m7b5 spelling as shown in your Chord Builder. If you're trying for the classical diminished with a scale tone (natural 7) then I don't think you can do that in Biab.

Bob


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