I found some old threads where people were talking about supporting a modifier for chords so that g:7alt would be rendered as in this example:
I realize that this would pose a problem for midi generation since (I think) such a chord is non-deterministic. That is, the person comping has a choice between (sharp 5, sharp 9), (sharp 5, flat 9), and two others. I know I could just pick on and write, e.g., g:7.5-.9+, but I'd rather not.
However it's pretty common usage in jazz.
Was it decided not to do it, or is there a way?
Thanks!