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Re: Transposing instruments in orchestra score

From: Jan-Peter Voigt
Subject: Re: Transposing instruments in orchestra score
Date: Mon, 12 May 2014 13:57:10 +0200
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Hi again,

I didn't actually tell what the engraver is actually for:
The "autoTranspose"-engraver transposes music automatically, if there
are three context-properties set:
* instrumentTransposition is the pitch, which is set by \transposition
* music-concert-pitch tells whether the music in this context is
provided in concert-pitch (boolean)
* print-concert-pitch tells whether the music shall be printed in
concert-pitch (boolean)

Now, if you set music-concert-pitch to #t and print-concert-pitch to #f,
the music is transposed by instrumentTransposition. There are no extra
transpose{}-constructs needed and \instrumentSwitch may set

Cheers, Jan-Peter

Am 12.05.2014 11:16, schrieb Jan-Peter Voigt:
> Hi there,
> I read a few of the messages regarding the given subject. I don't have a
> once-and-for-all-solution, but I want bring in another scheme-engraver:
> It uses context-properties 'instrumentTransposition, (newly defined)
> 'music-concert-pitch' and 'print-concert-pitch'. If the music in the
> staff is in concert-pitch, but it shall be displayed in
> instrument-pitch, it is transposed from concert-pitch to
> instrument-pitch and vice versa. The transposition is done on
> note-events and key-change-events. Propably the engraver needs to listen
> to a few more.
> Two problems:
> 1. If the music is in instrument-pitch and shall be displayed in
> concert-pitch, the transposition is still active - so the midi is wrong
> 2. The engraver doesn't create a key-signature yet, if
> 'instrumentTransposition changes.
> Now, what do you think?
> Best, Jan-Peter

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