I did, however, need to define an xstruct macro if the enlarged font spanned more than one line:
\newlength{\myVSpace}% \setlength{\myVSpace}{2ex}% the default \newcommand{\xstruct}{\raisebox{-2\myVSpace}{\rule{0pt}{\myVSpace}}}
(Title environment) ERT[{\TitleFont \xstruc]The title spanning a couple of linesERT[}]
write this in the preamble and you do not need any ERT for the title, not for \xstrut not for the size
\let\myTitle\title
\renewcommand{\title}[1]{%
\myTitle{%
\fontsize{72}{72}\selectfont%
#1
}%
}Herbert
