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I also just realized something effectively Am6=F#m7b5=D9. Maybe not an is sign but work as substitution for each other(which also means the Am13 works)
My mind also took a detour to gypsy jazz for a second and it made me realize that that m6 on the top 4 strings that I tend to do in my solo can be combined with a m13 chord. I should try that sometime
Yes it is the A9 consists of the notes A, C#, G, B and E, if you take out the A you got yourself a C#m7b5. They are substitutions of each other. You could also consider an A9 as a C#m7b5/A for example.
Well more chord diagrams for me to draw into my notebook. The first example, like A 9 on the A string blew my mind, because it lacked the root completely, it only used the 3rd(C#), 5th(E), 6#(G) and 9th(B) of the A major scale. I gues there is still a lot to learn regarding chord theory