Thank you Wolfgang, that solves the mystery. (As the poster is for a philosophical association, "few words" is not applicable here.)

Am 08.06.2016 um 11:11 schrieb Wolfgang Schuster:
Thomas Fehige <mailto:tho...@fehige.de>
8. Juni 2016 um 10:35
Nevertheless, I prefer to keep all the font and fontsize definitions
and tweaks together in the preamble. This poster is not the only work
I'm planning to do in ConTeXt, and I need to learn to swim while
already in the water ;) .
For short texts where you want a certain style and size (e.g. a title
page or a poster with few words) \definedfont is the recommended method,
for larger amounts of the text (e.g. the abstract of a book) you can use
\switchtobodyfont to change the size.
Meanwhile I found the command \definebodyfontswitch and defined
switches like \normalsize, \scriptsize, \large, \Large etc.
The \definebodyfontswitch creates only a command which uses
\switchtobodyfont with a fixed number of arguments.
But this doesn't explain why \definebodyfontenvironment did not do
anything in my MNWE. The fonts book is not very clear on its intended
use.
You put spaces before and after = which aren’t allowed there.

\definebodyfontenvironment
   [24pt]
   [         small=22pt,
               big=28pt,
                 x=22pt,
                xx=16pt,
                 a=30pt,
                 b=40pt,
                 c=50pt,
                 d=60pt,
    interlinespace=30pt,
                em=italic]

\setupbodyfont[palatino,24pt]

\starttext

\startlines
  \tf   tf
{\tfa  tfa}
{\tfb  tfb}
{\tfc  tfc}
{\tfd  tfd}
{\tfx  tfx}
{\tfxx tfxx}
\stoplines

\stoptext

Wolfgang


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