Re: master 391ff93f763 3/4: * doc/misc/calc.texi (Musical Notes): Fix build with Texinfo 4.13.

[Ruijie Yu]

Hello Po Lu,

On Aug 9, 2023, at 09:51, Po Lu via Mailing list for Emacs changes 
<emacs-diffs@gnu.org> wrote:
> 
> branch: master
> commit 391ff93f763228fb62a8d658a190a60e4a0a1791
> Author: Po Lu <luangruo@yahoo.com>
> Commit: Po Lu <luangruo@yahoo.com>
> 
>    * doc/misc/calc.texi (Musical Notes): Fix build with Texinfo 4.13.
> ---
> doc/misc/calc.texi | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/doc/misc/calc.texi b/doc/misc/calc.texi
> index 00c0fa6001a..5064f76e7b8 100644
> --- a/doc/misc/calc.texi
> +++ b/doc/misc/calc.texi
> @@ -28476,12 +28476,12 @@ B and
> the octave numbered 0 was chosen to correspond to the lowest
> audible frequency.  Using this system, middle C (about 261.625 Hz)
> corresponds to the note @slanted{C} in octave 4 and is denoted
> -@slanted{C@sub{4}}.  Any frequency can be described by giving a note plus an
> +@slanted{C4}.  Any frequency can be described by giving a note plus an
> offset in cents (where a cent is a ratio of frequencies so that a
> semitone consists of 100 cents).

I presume you made this change because of a newly introduced warning/error -- 
sorry if I have missed any relevant discussion. 

However, the new version would (IIRC) misalign with the usual musical notation, 
where we have "C" and "4" side by side in italics, but what we really need is 
"C" and subscripted "4", maybe both italicized (I don’t know whether we really 
need italicization, someone else might have a better idea). 

I don’t have any experience in writing texi files, but can we do this instead 
without triggering any warnings/errors? 

    @slanted{C}@sub{@slanted{4}}

> The midi note number system assigns numbers to notes so that
> -@slanted{C@sub{-1}} corresponds to the midi note number 0 and 
> @slanted{G@sub{9}}
> +@slanted{C-1} corresponds to the midi note number 0 and @slanted{G9}
> corresponds to the midi note number 127.   A midi controller can have
> up to 128 keys and each midi note number from  0 to 127 corresponds to
> a possible key.

And also here regarding C-1 and G9. 

Thanks. 

--
Best,


RY