Fix subscripts in the Calc manual

* doc/misc/calc.texi (Musical Notes): Use @sub instead of TeX-only
'_' notation.  For the details, see the discussion in
https://lists.gnu.org/archive/html/emacs-devel/2023-06/msg00096.html.
This commit is contained in:
Eli Zaretskii 2023-06-15 10:08:55 +03:00
parent 70fc7c41ef
commit f73f82d7e8

View file

@ -28470,13 +28470,13 @@ B and
@c flat and @expr{B}.
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 @expr{C} in octave 4 and is denoted
@expr{C_4}. Any frequency can be described by giving a note plus an
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
offset in cents (where a cent is a ratio of frequencies so that a
semitone consists of 100 cents).
The midi note number system assigns numbers to notes so that
@expr{C_(-1)} corresponds to the midi note number 0 and @expr{G_9}
@slanted{C@sub{-1}} corresponds to the midi note number 0 and @slanted{G@sub{9}}
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.