Yes, that C7(9) is a style from fakebooks of the 60s and 70s. C9 means the same thing; the dominant 7th is included. You'll also see C7(13) which can be C13 (the 9 and perhaps 11 are implied as included).

If this bothers you when keying in charts, and you want to create a keyboard shortcut, you can. But your main intent seems to be to duplicate the printed fakebook style, and you would need a notation program for that. Even so, some of them can't print it with the 7 and 9 vertical.

As far as the Dim / Dim7, that is a direct result of PG Music responding to the Wishlist to give us the option John described. It was a happy day.


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