[NTG-context] Making font smaller in \starttyping environment?

Hello, I know I should be able to do it (and think I've done it once upon a time), but how do I change the font size just for \tt and for \starttyping \stoptyping environment? I have no problems with the font used, I just want my typed text to be a tad smaller (like \tfx for that font). Once again I feel very bewildered in the font land... Thanks, Mari