> On 1 May 2020, at 13:22, Wolfgang Schuster 
> <wolfgang.schuster.li...@gmail.com> wrote:
> 
> Gerben Wierda schrieb am 01.05.2020 um 13:15:
>> The following code:
>> \enabletrackers[context.trace]
>> %\usemodule[article-basic]
>> \starttypescript [sans] [optima]
>>    \setups[font:fallback:sans]
>>    \definefontsynonym [Sans]           [file:Optima.ttc(Optima Regular)]     
>> [features=default]
>>    \definefontsynonym [SansBold]       [file:Optima.ttc(Optima Bold)]        
>>  [features=default]
>>    \definefontsynonym [SansItalic]     [file:Optima.ttc(Optima Italic)]      
>>  [features=default]
>>    \definefontsynonym [SansBoldItalic] [file:Optima.ttc(Optima Bold Italic)] 
>> [features=default]
>> \stoptypescript
>> \definetypeface [optima] [ss] [sans] [optima] [default]
> 
> Set a math font to avoid problems.
> 
>> \setupbodyfont [optima]
>> \starttext
>> \startMPpage[instance=doublefun]
>>   picture pic;
>> pic := textext("\definebodyfont[14.9pt][rm][default=Regular at 
>> 14.9pt]\switchtobodyfont[14.9pt]\setupinterlinespace[16.9pt]\framed[align=center,frame=off,offset=none,width=335.350bp]{\colored[r=0.000,
>>  g=0.000, b=0.000]{\rm (Artifact)\\}}");
> 
> You use \rm here which is used to switch to the serif typeface. When your 
> goal is to enforce the upright alternative you use the wrong command because 
> you need \tf for this.

Thank you, that got me the right info on ConTeXtgarden. I now use \tf and:

\starttypescript [sans] [optima]
   \setups[font:fallback:sans]
   \definefontsynonym [Sans]           [file:Optima.ttc(Optima Regular)]     
[features=default]
   \definefontsynonym [SansBold]       [file:Optima.ttc(Optima Bold)]        
[features=default]
   \definefontsynonym [SansItalic]     [file:Optima.ttc(Optima Italic)]      
[features=default]
   \definefontsynonym [SansBoldItalic] [file:Optima.ttc(Optima Bold Italic)] 
[features=default]
\stoptypescript

\definetypeface [optima] [ss] [sans] [optima] [default]
\definetypeface [optima] [rm] [serif] [optima] [default]
\definetypeface [optima] [tt] [mono] [modern] [default]
\definetypeface [optima] [mm] [math] [optima] [default]

\setupbodyfont [optima]

As I now understand it, I have now defined the typescript for sans, but created 
a setup that sans is the fallback. I have also defined rm, tt and mm explicitly.

But my guess is that if I had used ss instead of rm everywhere in my code it 
would have worked as well.

G

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