I want to use correct Yoruba orthography with diacritical marks beneath the
letters and tone marks above them
You _may_ be able to find everything you need by looking in the Insert
Symbol chart for a standard font like Times New Roman (or Arial or
Tahoma, not that you'd actually use them for anything serious). Look
in the areas called "Latin Extended A" and "Latin Extended B."
It's possible that those fonts don't include everything you need. In
that case, you should download the font called Gentium from the Summer
Institute of Linguistics (just google "gentium" feeling lucky and it
takes you right to the download page). It probably has everything you
need.
Once you locate the characters you want, use the window at the bottom
of Insert Symbol to assign your own keystrokes to them so you can type
them comfortably. For instance, for letters with dots under, I use
Ctrl-Alt-. (period/full stop), followed by the letter. Be sure the
place is checked where it says to save it to the normal.dot template,
and you can type the letter in any new document with that key
sequence. (I suppose it'll work throughout Office, but I've never had
to find out.)
In case they don't have characters with both the tone mark above and
the diacritic below, you'll need to go to the "Combining Diacritics"
section of the font. Again you can make a custom keystroke; you type
the additional diacritic after the letter above or below which it goes.
