Controling spacing between wrapped gloss lines in expex

Question

I'm glossing long lines of text with the expex package. When the glwords wrap to a new line, there doesn't seem to be any space added. For a large block of text it helps to have a little space there. I am able to get more or less what I want by adding a strut in the first lines, but of course this adds a little vertical space above the very first line as well.

\documentclass{book}
\usepackage{expex}
\begin{document}
Default spacing:

\ex \begingl
\gla Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Nam consectetuer mollis dolor.// 
\glb Sed dolor. Praesent a lacus vitae turpis consequat semper. Duis sem velit,//
\endgl\xe

Desired spacing (almost):

\ex[everygla={\it\rule{0pt}{20pt}}] \begingl
\gla Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Nam consectetuer mollis dolor.// 
\glb Sed dolor. Praesent a lacus vitae turpis consequat semper. Duis sem velit,//
\endgl\xe
\end{document}

Answer 1

There's a parameter for this: extraglskip (see §11.3 of the docs):

\documentclass{book}
\usepackage{expex}
\begin{document}
Default spacing:

\ex \begingl
\gla Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Nam consectetuer mollis dolor.// 
\glb Sed dolor. Praesent a lacus vitae turpis consequat semper. Duis sem velit,//
\endgl\xe

Desired spacing?

\ex[extraglskip=!.75ex] \begingl
\gla Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Nam consectetuer mollis dolor.// 
\glb Sed dolor. Praesent a lacus vitae turpis consequat semper. Duis sem velit,//
\endgl\xe
\end{document}