[texhax] register allocation in musixps.tex

[Bob Tennent]

musixtex originally used special fonts to generate slurs and
ties. But around 2000, Stanislav Kneifl wrote musixps.tex,
an add-on package that generates Postscript commands for
slurs and ties, and this is now the standard tool for
MusiXTeX users; see Chapters 10 and 11 of

http://mirrors.ctan.org/macros/musixtex/doc/musixdoc.pdf

But musixps imposes a maximum of 10 slurs/ties allowed
to cross a line break, presumably to keep within the
limitations of plain TeX. It is now standard to use
etex with musixtex and there is a need for more than
10 slurs/ties allowed to cross a line break. Kneifl is
unwilling, after almost 20 years, to tackle significant
modifications and neither is anybody in the MusiXTeX
community.

Would anybody with strong TeX-pertise like to look into
this? You can find musixtex.tex and musixps.tex here:

https://www.ctan.org/tex-archive/macros/musixtex/tex

There is some documentation for musixps at the end
of musixps.tex.

Bob Tennent