I just saw this comment by Tim, in another question:
Do can't have a C. It's spelt D, F, Ab, Cb.Or as a triad, just the 1st 3 notes. Ao/F is F b9, and Ao/F# will just be F#o. Or D b9/F#. If this helps - hope so.
What exactly are
F#°? This is the first time I have seen something like this.