\starttypescript[myFonts] \definetypeface [mySerifFont] [rm] [serif] [mySerifFont] [default] \definetypeface [mySansFont] [ss] [sans] [mySansFont] [default] \stoptypescript
\starttypescript[myFonts] \definetypeface [myFonts] [rm] [serif] [mySerifFont] [default] \definetypeface [myFonts] [ss] [sans] [mySansFont] [default] \stoptypescript You need the same name for both typefaces. Are you sure ? This works though... \setuppapersize [A4][A4] \starttypescript [serif] [mySerifFont] \definefontsynonym [mySerifFontRegular] [name:Times New Roman] [features=default] \definefontsynonym [mySerifFontItalic] [name:Times New Roman Italic] [features=default] \definefontsynonym [mySerifFontBold] [name:Times New Roman Bold] [features=default] \definefontsynonym [mySerifFontBoldItalic] [name:Times New Roman Bold Italic] [features=default] \stoptypescript \starttypescript [serif] [mySerifFont] \setups[font:fallback:serif] \definefontsynonym [Serif] [mySerifFontRegular] \definefontsynonym [SerifItalic] [mySerifFontItalic] \definefontsynonym [SerifBold] [mySerifFontBold] \definefontsynonym [SerifBoldItalic] [mySerifFontBoldItalic] \stoptypescript \starttypescript [sans] [mySansFont] \definefontsynonym [mySansFontRegular] [name:Arial] [features=default] \definefontsynonym [mySansFontItalic] [name:Arial Italic] [features=default] \definefontsynonym [mySansFontBold] [name:Arial Bold] [features=default] \definefontsynonym [mySansFontBoldItalic] [name:Arial Bold Italic] [features=default] \stoptypescript \starttypescript [sans] [mySansFont] \setups[font:fallback:sans] \definefontsynonym [Sans] [mySansFontRegular] \definefontsynonym [SansItalic] [mySansFontItalic] \definefontsynonym [SansBold] [mySansFontBold] \definefontsynonym [SansBoldItalic] [mySansFontBoldItalic] \stoptypescript \starttypescript[myFonts] \definetypeface [mySerifFont] [rm] [serif] [mySerifFont] [default] \definetypeface [mySansFont] [ss] [sans] [mySansFont] [default] \stoptypescript \usetypescript[myFonts] \setupbodyfont[mySerifFont,12pt] \definefont[myChapterFont][mySansFontRegular sa 1.728] \setuphead[chapter][style=\mySansFont\myChapterFont] \starttext \chapter{chapter test} \section{section test} text test \stoptext Alan