P.S. This may be a more elegant solution :
\documentclass{article}
\usepackage{xltxtra} %or xunicode
\usepackage{linguex}
\setmainfont{Charis SIL}
\begin{document}
\def\implementTIPAtextx#1{\scantokens{#1\endinput}\egroup}
\ex. \textipa{DOES THIS WORK?}
\end{document}
** Phil.
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