Re: How can I let the ambitus engraver ignore the key signature?

[M Watts]

David Kastrup wrote:
> David Kastrup <address@hidden> writes:
>
>   
> > M Watts <address@hidden> writes:
> >
> >     
> > > David Kastrup wrote:
> > >       
> > > > Hi, the following is an excerpt from a systematic listing of accordion
> > > > chords with different ambitus.  The ambitus engraver should not heed the
> > > > first (arbitrary) key signature but rather engrave as though we were in
> > > > c major.
> > > >
> > > > How do I do that?
> > > >
> > > >   
> > > >         
> > > I guess you discovered that if you try setting a key signature just
> > > for the ambitus, then changing it for the music, results in the
> > > amusing "warning: Two simultaneous key-change events, junking this
> > > one", which doesn't work.
> > >
> > > One solution is to add this line to each \new Voice:
> > >
> > > \override AmbitusAccidental #'(glyph-name-alist) = #'((0 . null) (-1/2
> > > . null) (1/2 . null) (1 . null) (-1 . null))
> > >
> > > The console spits out "warning: Could not find glyph-name for
> > > alteration -1/2" etc. etc., but it seems to do the job.
> > >       
> > Wouldn't that just leave off the accidentals from the ambitus?  That
> > would not be the desired effect.  The desired effect is to have
> > accidentals relative to C major.
> > I have not checked yet, but nulling the glyph-names would appear to have
> > this effect, or do I just not understand what is done here?  If the
> > latter, could you explain?
> >     
>
> Actually, I have not been able to find a place in my posted example code
> where the above incantation would cause either a change or a warning.
>
> Hm.
>
>   

I placed "the above incantation" immediately after the \clef bass lines, 
and ran your example code with 2.12.2.

It removes all accidentals from the ambitus -- I misunderstood :eek:

But to get the ambitus relative to C major, you'd need to have the first 
bar in C major, even if it's just invisible spacer notes,