Dear Michael,

For general help, it's best to ask the gregorio list (CC of this mail)

> 1) How to change font and size for the annotation?

See GregorioRef.pdf section 2.2.10 (Styling). I'm using version
4_2-beta1, which you can find at the bottom of:

https://github.com/gregorio-project/gregorio/releases/tag/v4.2.0-beta1

> 2) How to display a barred V (℣) for the commentary? If I type a
> barred V (℣) directly in the commentary section of the gabc code, it
> will be omitted /disappear in the output; but if I type <sp>V/</sp>,
> it cannot be recognized and will be rendered as is.

See GregorioRef section 2.2.8 (Barred letters)

> 3) The punctum inclinatum appears to be thicker (or "fatter") than
> those printed in GR. Especially, in a climacus it looks obvious that
> the space between the two punctos inclinos is quite narrow. (And I
> think all the neumes output by GregorioTeX are a little thicker than
> those found in GR in general.) Can it (the glyph) be
> controlled/modified by some means so that it can be a little
> thinner?

The punctum inclinatum is from a font called greciliae, based on
caeciliae. It has its own style, a bit different from the one of
Solesmes old books... You cannot change that easily, but if you want to
draw a new font, there is some help with the (quite heavy) machinery
used by Gregorio to build fonts here:

https://github.com/gregorio-project/gregorio/tree/master/fonts

> 4) Can I manually add ledger line(s) or extend the length of it? The 
> algorithm of GregorioTeX seems to add ledger line for low/high note
> only when necessary. However, in GR it is found frequent that the
> extra line is lengthened and even extended to the entire neume, which
> helps sight reading a lot.

See GregorioRef.pdf section 6.5 (Custom Ledger Lines)

> 5) It seems that GregorioTeX automatically adjust the space between
> the staff and the lyric when there is ledger line(s) below the
> staff. However, it applies the adjustment globally to all staffs
> regardless whether there is ledger line(s) or not in a specific
> staff. Can it adjust the space only for the staffs that contain extra
> line(s), and keep the space unchanged for those that do not contain
> extra line?

It does that if you compile the document twice. I suggest you use
"latexmk" to compile (with the "-lualatex" option), it will detect
automatically if it needs to compile the document again or not.

Thank you!
-- 
Elie

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