On page six of the pmx manual near the bottom of the page you'll find the
answer to your question.
"The number of lines in a voice can only be 1 or 2,..." That means what
you're asking for is not directly possible with PMX. The only solution
would be inline TeX, i.e. the third line of music has to be coded directly
using musixTeX commands, bypassing PMX. I think the reason for that is
that it is not easy to set up general rules for stem direction, beaming
and note head shifting in case that more than two lines of music share
the same five lines.
regards
Bernhard
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