Most of these values can be changed, but only between the end of the previous system and the beginning of the next one. This can be inserted between a normalshapemediumseriesnormalshapemediumseries\suspmorceau (or a normalshapemediumseriesnormalshapemediumseries\finmorceau) and a normalshapemediumseriesnormalshapemediumseries\reprmorceau (or a normalshapemediumseriesnormalshapemediumseries\debutmorceau), but it is wiser to say, for example:
\def\atnextline{\global\staffbotmarg=5\Interligne}
When doing so, the MusicTEX user should be aware that this could disturb pending slurs or ties, since the altitude of these is stored in an absolute way, starting from the baseline of the systems. Therefore, changing the normalshapemediumseriesnormalshapemediumseries\staffbotmarg dimension can also be made by means of normalshapemediumseries normalshapemediumseriesnormalshapemediumseries\advancebottom{ < dimension >} which updates all pending slur and tie altitudes by the given dimension. This has been used in normalshapemediumseries pacifiqn and normalshapemediumseriespacifiqb.
The user may prefer to redefine normalshapemediumseries\
def
normalshapemediumseriesnormalshapemediumseries\bottomfacteur or normalshapemediumseries\def
normalshapemediumseriesnormalshapemediumseries\interfacteur to a
given integer number, but this can be done only between a
normalshapemediumseriesnormalshapemediumseries\suspmorceau (or a
normalshapemediumseriesnormalshapemediumseries\finmorceau) and a
normalshapemediumseriesnormalshapemediumseries\reprmorceau (or a
normalshapemediumseriesnormalshapemediumseries\debutmorceau), but it is wiser to use
normalshapemediumseriesnormalshapemediumseries\atnextline as previously.
It is also wise to use
normalshapemediumseriesnormalshapemediumseries\atnextline to change the the
number of instruments, the staff spacings, the number of staffs at the next
line... provided that the coding of the notes resists an unexpected
line change executing the
normalshapemediumseriesnormalshapemediumseries\atnextline.
In anycase it is a good idea to look at the procedures
normalshapemediumseriesnormalshapemediumseries\computewidths and
normalshapemediumseriesnormalshapemediumseries\computespecifics to understant what
they really compute, and also to find the places where they are actually
invoked.