I have tried implementing your suggestions, but I seem to be missing something. I'm not sure whether what I'm missing is in my knowledge or in my files, but hopefully you can help me figure it out.
Gregoriotex seems to be missing a file. Here is my output:
This is LuaHBTeX, Version 1.12.0 (TeX Live 2020)
system commands enabled.
(./Test314.tex
LaTeX2e <2020-10-01> patch level 4
tput: No value for $TERM and no -T specified
L3 programming layer <2021-02-18>
(/usr/local/texlive/2020/texmf-dist/tex/latex/base/article.cls
Document Class: article 2020/04/10 v1.4m Standard LaTeX document class
(/usr/local/texlive/2020/texmf-dist/tex/latex/base/size11.clo))
(/usr/local/texlive/2020/texmf-dist/tex/latex/fontspec/fontspec.sty
(/usr/local/texlive/2020/texmf-dist/tex/latex/l3packages/xparse/xparse.sty
(/usr/local/texlive/2020/texmf-dist/tex/latex/l3kernel/expl3.sty
(/usr/local/texlive/2020/texmf-dist/tex/latex/l3backend/l3backend-luatex.def))
(/usr/local/texlive/2020/texmf-dist/tex/latex/l3packages/xparse/xparse-2020-10-
01.sty
(/usr/local/texlive/2020/texmf-dist/tex/latex/l3packages/xparse/xparse-generic.
tex)))
(/usr/local/texlive/2020/texmf-dist/tex/latex/fontspec/fontspec-luatex.sty
(/usr/local/texlive/2020/texmf-dist/tex/latex/base/fontenc.sty)
(/usr/local/texlive/2020/texmf-dist/tex/latex/fontspec/fontspec.cfg)))
(/usr/local/texlive/2020/texmf-dist/tex/lualatex/gregoriotex/gregoriotex.sty
(/usr/local/texlive/2020/texmf-dist/tex/latex/xcolor/xcolor.sty
(/usr/local/texlive/2020/texmf-dist/tex/latex/graphics-cfg/color.cfg)
(/usr/local/texlive/2020/texmf-dist/tex/latex/graphics-def/luatex.def))
(/usr/local/texlive/2020/texmf-dist/tex/latex/kvoptions/kvoptions.sty
(/usr/local/texlive/2020/texmf-dist/tex/latex/graphics/keyval.sty)
(/usr/local/texlive/2020/texmf-dist/tex/generic/ltxcmds/ltxcmds.sty)
(/usr/local/texlive/2020/texmf-dist/tex/generic/kvsetkeys/kvsetkeys.sty))
(/usr/local/texlive/2020/texmf-dist/tex/generic/iftex/ifluatex.sty
(/usr/local/texlive/2020/texmf-dist/tex/generic/iftex/iftex.sty))
(/usr/local/texlive/2020/texmf-dist/tex/latex/graphics/graphicx.sty
(/usr/local/texlive/2020/texmf-dist/tex/latex/graphics/graphics.sty
(/usr/local/texlive/2020/texmf-dist/tex/latex/graphics/trig.sty)
(/usr/local/texlive/2020/texmf-dist/tex/latex/graphics-cfg/graphics.cfg)))
(/usr/local/texlive/2020/texmf-dist/tex/luatex/luatexbase/luatexbase.sty
(/usr/local/texlive/2020/texmf-dist/tex/luatex/ctablestack/ctablestack.sty))
(/usr/local/texlive/2020/texmf-dist/tex/luatex/luamplib/luamplib.sty)
(/usr/local/texlive/2020/texmf-dist/tex/generic/xstring/xstring.sty
(/usr/local/texlive/2020/texmf-dist/tex/generic/xstring/xstring.tex))
(/usr/local/texlive/2020/texmf-dist/tex/luatex/gregoriotex/gregoriotex-main.tex
(/usr/local/texlive/2020/texmf-dist/tex/luatex/gregoriotex/gregoriotex-common.t
ex)
(Test314.gaux)
(/usr/local/texlive/2020/texmf-dist/tex/luatex/gregoriotex/gregoriotex-spaces.t
ex)
(/usr/local/texlive/2020/texmf-dist/tex/luatex/gregoriotex/gregoriotex-chars.te
x)
(/usr/local/texlive/2020/texmf-dist/tex/luatex/gregoriotex/gregoriotex-signs.te
x)
(/usr/local/texlive/2020/texmf-dist/tex/luatex/gregoriotex/gregoriotex-syllable
.tex)
(/usr/local/texlive/2020/texmf-dist/tex/luatex/gregoriotex/gregoriotex-symbols.
tex)
! I can't find file `gsp-default.tex'.
<to be read again>
\relax
l.2032 \greloadspaceconf{default}
%
(Press Enter to retry, or Control-D to exit)
Please type another input file name:
I navigated to the directory that such files as gregoriotex-symbols.tex are in, and added gsp-default.tex using what I found on the gregoriotex github, to no avail. Does this look like I need to re-install?
Thank you.
In Domino,
Michael C.