\documentclass[12pt]{book}
\usepackage{graphicx}
\usepackage[textwidth=10.5cm, vmargin=2cm]{geometry}
\geometry{a5paper}
\usepackage{gregoriotex}
\usepackage{fontspec}
\usepackage{xcolor}
\usepackage{fancyhdr}
\usepackage{microtype}
\usepackage{polyglossia}
\setdefaultlanguage{latin}
\setotherlanguage{italian}
\usepackage{scrextend}
\changefontsizes{12,5pt}
\defaultfontfeatures{Ligatures={TeX}}
\setmainfont[Numbers={Proportional,OldStyle}]{Arno Pro}

\newfontfamily\integrativo{APIntegrativo}
\newcommand{\integchar}[1]{{\integrativo\char#1}}
\newcommand{\myAbar}{\color{red}\integchar{8449}}
\newcommand{\myRbar}{\color{red}\integchar{8479}}
\newcommand{\myVbar}{\color{red}\integchar{8483}}
\newcommand{\myAbarsm}{\color{red}\integchar{57392}}
\newcommand{\myRbarsm}{\color{red}\integchar{57393}}
\newcommand{\myVbarsm}{\color{red}\integchar{57394}}

\begin{document}

%%%%%%%
\GreLoadSpaceConf{myspaces}
\input{prove-conf.tex}
\setinitialspacing{2mm}{2,8cm}{2mm}
%%%%%%%

\pagestyle{fancy}

\fancyhead[LE,RO]{\small{\thepage}}
\fancyhead[CE]{\commentfont{\sectionmark{}}}%
\fancyhead[CO]{\commentfont{\chaptermark{}}}%
\fancyfoot[C]{}

\raggedbottom 

\includeant{Iudæa et Ierusalem}{ant--iudaea-et-ierusalem.tex}{1 \myAbarsm\ viii}{g}{2 Chr 20, 17}
\includeant{Crastina erit vobis}{ant--crastina-erit-vobis.tex}{5 \myAbarsm\ viii}{c2}{1 Sam 11, 9}
\includeant{Ecce completa sunt}{ant--ecce-completa-sunt.tex}{\myAbarsm\ viii}{c}{}


\end{document}
