Thanks to Taco, I have some progress in developing "guitar chord" command.

My current trouble is how to develop the "mark" MP macro and where to put it? Inside startuseMPgraphic?

drawoptions(withpen pencircle scaled 0.4pt withcolor black) ;
draw hlingrid(0, 5, 1, 0.8cm, 1cm) ;
draw vlingrid(0, 4, 1, 1cm, 0.8cm) ;
draw mark(1,\MPvar{e});
draw mark(2,\MPvar{B});
draw mark(3,\MPvar{G});
draw mark(4,\MPvar{D});
draw mark(5,\MPvar{A});
draw mark(6,\MPvar{E});



Best Regards,
Vyatcheslav Yatskovsky
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