(Sorry for the preceding message, I forgot the [NTG-context] for filters...)

Dear all, I try to use Open Type fonts with ConTeXt and XeTeX (I recently did the same with LaTeX using fontspec and mathspec packages). >From the web site, I managed to use them for standard text as well as roman alphabet in math. Unfortunately, greek letters stay printed with the Latin Modern font. From examples of the web site, I tried the following lines but without success. In a preceding post, there was a similar question but with the luatex engine.
Thanks for your help !

\definetypeface[myface][rm][Xserif][GFS Didot]
\definetypeface[myface][mm][math][GFS Didot]

\starttext

Normal text.

\startformula
\alpha + \beta = 10
\stopformula

\stoptext

--
Flavien.
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"Quantum objects are completely crazy but, at least, they are all crazy in the same way." R.P. Feynman.