Werner Icking wrote, on the topic of a PMX variant that allows 15 voices:
>
> So your PMX-variant may result in nasty error-situations that
> PMX generates a MusiXTeX-source which cannot be processed by
> MusiXTeX. I hate such situations because such problems need
> much MusiXTeX and TeX knowledge which makes it hard to recommend
> PMX to "simple-minded" users.
>
But: (a) it is anyway impossible to check that a given PMX score
generates clean MusiXTeX because of the inline TeX feature;
(b) by definition, a user who writes scores with more than
twelve instruments cannot possibly be simple-minded.
> For your PMX-variant at least an additional file like musixadd.tex
> or musixmad.tex is neccessary. I don't know whether there are
> enough (e.g.) dimensions in TeX to introduce three more instruments.
PMX always generates "\input musixmad" even if your score has one
instrument, one music line and one note.
So I vote in favour of the big PMX.
Dirk