I almost obtained the snippet of the challenge with the attached source by
adding a "temporary" third beam. I intentionally let the beginning portion
of this 3rd beam so you understand the logic, but you can get rid of it
saying a \loffset bigger than 24 or so at line #8.
But: 1: does anybody know where the "parasitic" beam portion below the
staff comes from?
2: how to shorten stemlenghts so they do no climb above the 2nd beam?
Otherwise my process would be easier than yours to put into a macro
because it's difficult to write a macro that does something at <pitch p>
*and* <pitch p+1>
Bye
Jean-Pierre Coulon
\input musixtex
\nostartrule
\startextract
\notes\ibu0l{-1}\nbbu0\nbbbu0\qb0{jhi}\tbbbu0\qb0e\hqsk\en
\notes\nbbbu0\qb0{_i}\tbbu0\tbbbu0\nbbbu0\qb0e\en
\notes\nbbu0\qb0h\tbbbu0\qb0c\hqsk\en
\notes\nbbbu0\qb0{^ge}\hqsk\qb0{=g}\tbbbu0\tbbu0\loffset{20}{\tbu0}\qb0c\en
\zendextract
\end
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