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<blockquote style="border: 0px none;" cite="mid:56D71230.8040407@gmx.es"
 type="cite">
  <div style="margin:30px 25px 10px 25px;" class="__pbConvHr"><div 
style="width:100%;border-top:1px solid #EDEEF0;padding-top:5px">   <div 
style="display:inline-block;white-space:nowrap;vertical-align:middle;width:49%;">
        <a moz-do-not-send="true" href="mailto:oinos@gmx.es" 
style="color:#737F92 
!important;padding-right:6px;font-weight:bold;text-decoration:none 
!important;">Pablo Rodriguez</a></div>   <div 
style="display:inline-block;white-space:nowrap;vertical-align:middle;width:48%;text-align:
 right;">     <font color="#9FA2A5"><span style="padding-left:6px">2. 
März 2016 um 17:17</span></font></div>    </div></div>
  <div style="color:#888888;margin-left:24px;margin-right:24px;" 
__pbrmquotes="true" class="__pbConvBody"><div><!----><br>Wolfgang,<br><br>I’m
 afraid that even with that, I’m afraid it doesn’t work well:<br><br>   
 \definefallbackfamily[mainface][rm][Latin Modern Math]<br>        
[tf=<a class="moz-txt-link-freetext" href="file:newg8-regular">file:newg8-regular</a>, scale=0.88, range=0x22C0]<br>    
\definefallbackfamily[mainface][rm][Latin Greek Math]<br>    
[tf=<a class="moz-txt-link-freetext" href="file:newg8-regular">file:newg8-regular</a>, range=preset:greek]<br>    
\definefontfamily[mainface][rm][Latin Modern Roman]<br>    
\definefontfamily[mainface][tt][GreekTT][tf=<a class="moz-txt-link-freetext" href="file:newg8-regular">file:newg8-regular</a>]<br>    
\definefontfamily[mainface][ss][GaraMath][tf=<a class="moz-txt-link-freetext" href="file:newg8-regular">file:newg8-regular</a>]<br><br>
    \setupbodyfont[mainface]<br><br>    \starttext<br>    α ⋀ {\tt α} 
a{\ss a}b{\ss b}c{\ss c}g{\ss g}<br>    \stoptext<br><br>If another 
"key=value" pair is specified, "tf=<a class="moz-txt-link-freetext" href="file:newg8-regular">file:newg8-regular</a>"<br>doesn’t seem 
to work.<br><br>What am I doing wrong?<br>
</div></div>
</blockquote>
Don’t write just some garbage as third argument for the 
\definefontfamily or \definefallbackfamily commands.<br>
<br>
In the attached picture you can see the fonforge information for the 
font names,<br>
needed for the \definefontfamily command is the "family name" value.<br>
<br>
\definefallbackfamily[mainface][rm][GaramondNo8][scale=0.88,range=0x22C0]<br>
<br>
Wolfgang<br>
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