I would like a special dialog box that could be opened with a right click.

The box would have a field where you type the name of the root and then check boxes for all the intervals above the root so you could choose your own. That way if you wanted a C minor add 9 you could type C and check the box near the following, m3, 5, and 9

You could then build any chord you wanted.

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Bob "Notes" Norton smile Norton Music
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