[NTG-context] Glyph Variants with MKIV

Hi, How can I use glyph variants with ConTeXt/LuaTeX? Khaled posted an example with LuaLaTeX[1] and I would like to use that in a ConTeXt document. Can this be achieved with simplefonts or even directly? Something like this: \usemodule[simplefonts] \setmainfont[zapfinoextraltpro] \starttext \setupsimplefonts[variant=2] \input knuth \setupsimplefonts[variant=3] \input knuth \stoptext Adam [1] http://tex.stackexchange.com/questions/29123/can-i-get-lualatex-to-do-font-v...