Re: incipits

[Jean Abou Samra]

Le 04/08/2021 à 03:37, Kees van den Doel a écrit :
> I have a score with different key signatures in the voices. The 
> incipit does not align properly as the flat takes space and shifts 
> things.
> See attached. I've simply added the incipits to each voice as in the 
> example in the docs.
>
> I've tried adding key signature to top incipit voice and setting
>   \once \override KeySignature.transparent = ##t
> but this does not hide the flat.


\override without a context applies to the bottommost context,
which is a MensuralVoice in this case. The KeySignature object
is created in MensuralStaff, so the \override does not reach
it. This will hide the key signature:

\override MensuralStaff.KeySignature.transparent = ##t

However, the transparent property is meant to hide objects
but keep them taking space. To remove an object, rather
set stencil:

\override MensuralStaff.KeySignature.stencil = ##f

This can be shortened as

\omit MensuralStaff.KeySignature

(whereas the first override would be equivalent to
\hide MensuralStaff.KeySignature).

Please see

http://lilypond.org/doc/v2.23/Documentation/learning/visibility-and-color-of-objects#the-stencil-property

and

http://lilypond.org/doc/v2.23/Documentation/notation/visibility-of-objects


> Maybe related I would like to hide the mensural time signature as it's 
> not in the original. Again
>   \override TimeSignature.transparent = ##t
> has no effect.


Similarly, you want

\omit MensuralStaff.TimeSignature

Best,
Jean