\newif\ifTUG
\TUGfalse
%\TUGtrue
\ifTUG
  \documentclass{ltugproc}
\else
  \documentclass[a4paper]{article}
  \usepackage{mflogo}
\fi
\usepackage[tone,extra]{tipa}
\ifTUG\else
  \usepackage{codelist}
\fi
\usepackage{tipaman}

\title{\tipa{}: a System for Processing Phonetic Symbols in \LaTeX}
\author{FUKUI Rei
  \thanks{{\tt fkr@tooyoo.l.u-tokyo.ac.jp}}\\
  \textit{Department of Asian and Pacific Linguistics}\\
  \textit{Faculty of Letters}\\
  \textit{University of Tokyo}}
\date{\today}

\begin{document}
\maketitle

\input{tipaman1}
\ifTUG\bigskip\else\newpage\fi
\input{tipaman2}
\ifTUG\bigskip\else\newpage\fi
\input{tipaman3}
\ifTUG\bigskip\else\newpage\fi
\input{tipaman4}

\end{document}