Dear Don,
probably someone else can answer better than me to your questions. Here is what I can say at best of my knowledge.

I'm trying to typeset a Cantata with M-Tx. These questions have come up:

1. The intro and arias have 2 violins, soprano, and BC. I got that set up OK
with 4 staves. But the recits reduce to just soprano+BC. How can I reduce
the number of staves for one of these sections, then increase back to 4 for
the next?
Of course you can do it with in-line PMX command (%%), but "M-Tx 0.60 is not aware of movement breaks and the possibility to change the number of voices" (M-Tx manual, p. A-7). In this case M-Tx expects 4 lines of music instead of two and aputomagically puts two empty bars for the absent lines. The only solution I can imagine is to manually delete those lines of rests before to process the files with pmx. Maybe we can ask to Dirk to implement this feature in the next release of M-Tx?

For later sections, how can I apply a centered title, a tempo
marking above the start of the top staff, and an indentation if I want them?
All those features are available as in-line PMX command, but, we have to keep in mind that M-Tx isn't aware of.

2. M-Tx doesn't interpret "ef-2" or "c2 6 ,f" (in the BC) the same way PMX
does. Are these bugs,  features, or a violations of rules I'm unaware of?
M-Tx do not accept "ef-2", but "ef2-" or "e-f2".
M-Tx do not accept the shortcut "c2 6 ,f", but only "c2,f"

For an example I put here a code sended some time ago by Christian, modified by me (so the errors are mine and not by Christian!). We can see there the effect of the reduction from 4 to two voices inserted with PMX in-line command and the incorrect centering of the subtitle when we use the "\centerline" TeX command.

%%%%%%%%% Christian Mondrup 12/3/2001 %%%%%%%%% With mistakes inserted by L. Cataldi 9/8/2006
Title: My title
Composer: My composer
Style: Vls Singer Bass
Vls: Voices Vl1 Vl2; Clefs G G
Singer: Voices S; Vocal; Clefs G
Bass: Voices B; Clefs F
Name: Vl.~1 Vl.~2 Soprano Basso
Space: -2 -2 -2 -2

Meter: C
Pages: 1
Systems: 3

%%h
%%\centerline{Subtitle 1}
g4 g g g | g g g g | g g g g | g g g g |
g4 g g g | g g g g | g g g g | g g g g |
g4 g g g | g g g g | g g g g | g g g g |
g4 g e-f2 | g4 g g g | g g g g | g g g g |


%%L2Mn214bt
%%h
%%\centerline{Subtitle 2}
m3434 g2,g | g,g | g,g | g,g |
m3434 g2,g | g,g | g,g | g,g |

%%L3Mn41234batt
%%h
%%\centerline{Subtitle 3}
m4406 g4 g g g | g g g g | g g g g | g g g g |
m4406 g4 g g g | g g g g | g g g g | g g g g |
m4406 g4 g g g | g g g g | g g g g | g g g g | m4406 g4 g g g | g g g g | g g g g | g g g g |



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