In article <ADB71379-FD10-458F-AF5A-C1D4C9D995A4@di.unito.it>,
 Andrea Valle <valle@di.unito.it> wrote:

> Hi to all,
> 
> I'm plotting a phonetic formant chart with metapost inside context.
> I know I can't use TIPA, but I would be happy with utf8.

I did something similar with XeTeX and ConTeXt using the \sometxt macro, 
e.g.:

\definetypeface[myface][rm][Xserif][Charis SIL][default][encoding=uc]
\starttext
\startreusableMPgraphic{fig}
  u := 1cm;
  draw origin--(0,u)--(0,2u)--(0,3u);
  dotlabel.lft(\sometxt{Q}, origin); dotlabel.rt(\sometxt{R}, origin);
  dotlabel.lft(\sometxt{å