[NTG-context] symbols in luatex?

Hi all, first, a very happy new year 2008 to all of you! May ConTeXt continue to prosper and develop at a brisk pace :-) What better way to start the new year than asking a stupid question on the list? Here comes: I must be missing something really obvious here. I have a font (otf) with a number of (metrical) symbols which I use in a module. In mkii, I defined an encoding within this module to address the symbols: \startencoding[metr] \definecharacter metricbreve 66 \stopencoding so I can use the symbold with \metricbreve. Works great in mkii. But how do I do this in mkiv, which doesn't seem to read and use the encoding anymore? All best Thomas