Yeah, me too.

He asked if it is supported, and that answer is No.

He then asked if it could be done, and I think it can.

It is an interesting question. I didn't even address if it makes sense. I personally would not want to hear a dominant seventh chord with no fifth, and both the flat and sharp nine added. Perhaps 7alt will work. If not, choose either the flat nine or the sharp nine over a dominant seventh. Those are supported. Then if he thinks there is still a missing note, put it in the melody.



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