On Tue, 9 Jul 2002, taupin (wanadoo-lps) wrote:
> Hello, all:
> Several tentative MusiXTeX used asked me whether it was possible with
> MusiXTeX to select one or several instruments from a complete
> orchestra/choir score.
>
> At present time, not immediately possible unless writing macros with
> sophisticated TeX \if\then_else. I'm presently thinking not exactly to
> that, but to the opposite, i.e. cancelling output of one or several
> selected instruments.
>
> Two options are available:
> 1) One should be when using \selectinstrument, to check whether the
> instrument number given is Zero, in which case all input is ignored
> until a compulsory ending command sud as \endinstrument.
> 2) The second would test the staffnumbers of an instrument, and ignore
> all notes, beams, rests, appended texts if that instrument has a number
> of staffs equal to zero.
>
> The inconvenience of the solution 1) is that, if global commands are
> issued in the deleted text, they will be ignored.
> The inconvenience of the solution 2) is that if involves a test at each
> command, such as \qb, \qu, \zh, \zw, etc. Then, such a test could
> slightly slow down the compilation.
>
> In all cases, instrument numbers have to be defined as macros, so as to
> be able to keep the number of instruments equal to what is actually
> typed. For example:
>
> \def\Orgue{1}
> \def\Song{2}
> \def\Flute{3}
>
> and then alsays \selectinstrument\Orgue or \selectinstrument\Flute,
> and \setstaffs\Orgue2 and \setstaffs\Flute1
>
> Which then work whatever the actual instrument number of these two
> instruments.
>
> ----> Which solution seems better to you (knowing that solution 2) is
> easier, both for me a,d for the user).
>
I dont think the whole effort is worth your time: if one wants
individual instruments extracted from a full score, it is much
easier to use the pmx preprocessor, which has this facility built in
from the start.
ccn.
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