Hello,
I am trying to setup a layout for a book. Its very simple, consisting 
only of paragraphs. Regularly, there should be no space between them,
but to force the pages getting filled there may be a small space. I 
cannot figure out how to set it up.
In the mailing list I found the sample
\setupwhitespace[3pt plus 2pt minus 1pt]

but in fact, that seems to have no effect, the page ist not filled. The 
Reference-Manual doesnt mention this form, but states that there is some 
stretchability.
How can I define the stretchability?
My simple Example:


\definepapersize [NomosLexSozA] [width=125mm, height=210mm]

\setuppapersize [NomosLexSozA] [A4]

\setuplayout[

header=0cm,footer=0cm,

backspace=2.54cm,topspace=1.5cm,

width=middle,height=middle,

location=middle,marking=on,]

\showframe

\setuppagenumbering[alternative=doublesided]

\setupbodyfont[rm,7.5pt,serif]

\setupinterlinespace[line=8pt]

\setupbodyfontenvironment[default][em=italic]


\setupwhitespace[3pt plus 2pt minus 1pt]

%\setupwhitespace[line]

%\setupwhitespace[medium]

%\setupwhitespace[big]


\setuptolerance[horizontal, verytolerant, stretch]

\setuptolerance[vertical, verystrict]

\starttext

\dorecurse{40} {\input knuth}

\stoptext


with big or medium, it seems to work, but that is to much whitespace for 
my layout? Can anyone give me a hint?

Thanks,
Achim