I'm surprised by your statement that you think the guitar tracks lack support for extensions beyond the seventh. I write Brazilian jazz and hardly ever use a chord that doesn't have a higher extension than a seventh, and the guitar tracks play them beautifully:

9
b9
#9
11
13
b13

Could you identify what chord you want, and what styles and guitar RealTracks you are using, so we can duplicate what you are hearing? What does the guitar play if you write these higher extensions? The reason I asked is that, in the earlier days of RealTracks, I twice found a chord where an instrument would simply drop out, and I reported this to PG Music who immediately fixed it. That was the piano, by the way, never the guitar; the guitar has always played anything I threw at it.

More info, please. Thanks.


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