Actually I got lucky just now:

\definefontalternative[md]

\definefontalternative[mc]


Works just fine. Thank you for your suggestion Henning!


On Wed, May 25, 2022 at 7:35 PM Stefan Nedeljkovic <tsar.srb@gmail.com> wrote:
mtxrun --script fonts --list --all --pattern=Custodia
identifier               familyname   fontname                 filename                      subfont   instances

custodiabold             custodia     custodiabold             Custodia-Bold.ttf
custodiabolditalic       custodia     custodiabolditalic       Custodia-BoldItalic.ttf
custodiaitalic           custodia     custodianormalitalic     Custodia-NormalItalic.ttf
custodianormal           custodia     custodianormal           Custodia-Normal.ttf
custodianormalitalic     custodia     custodianormalitalic     Custodia-NormalItalic.ttf
custodiaregular          custodia     custodianormal           Custodia-Normal.ttf
custodiasemibold         custodia     custodiasemibold         Custodia-SemiBold.ttf
custodiasemibolditalic   custodia     custodiasemibolditalic   Custodia-SemiBoldItalic.ttf

I tried a different name, but the result was the same.

On Wed, May 25, 2022 at 7:12 PM Henning Hraban Ramm via ntg-context <ntg-context@ntg.nl> wrote:
Ah, sorry, didn’t know that. I can’t find an error in your code, but I
don’t have the (commercial) font to test. What’s the output of the
mtxrun font lookup?
Did you try a different shortcut from "mi"?

Hraban

Am 25.05.22 um 18:44 schrieb Stefan Nedeljkovic:
> It doesn't work for medium weights, as it is not standard. I took my
> solution from Wolfgang, here:
> https://tex.stackexchange.com/questions/303648/context-font-weights
> <https://tex.stackexchange.com/questions/303648/context-font-weights>
>
> On Wed, May 25, 2022 at 6:32 PM Henning Hraban Ramm via ntg-context
> <ntg-context@ntg.nl <mailto:ntg-context@ntg.nl>> wrote:
>
>     Hi Stefan,
>
>     I never used \definebodyfont but either \definefontfamily or
>     typescripts
>     with \definefontsynonym.
>
>     Did you try \definefontfamily[custodia][rm][Custodia] ?
>
>     https://wiki.contextgarden.net/Command/definefontfamily
>     <https://wiki.contextgarden.net/Command/definefontfamily>
>
>     Hraban
>
>     Am 25.05.22 um 18:20 schrieb Stefan Nedeljkovic via ntg-context:
>      >
>      > Dear list,
>      >
>      >
>      > I'm trying to set up Custodia in LMTX, but the
>     custodiasemibolditalic
>      > won't show up. It shows up regularly when I run mtxrun --script
>     fonts
>      > --list --all --pattern=Custodia
>      >
>      > I'm attaching the output for reference. Any help would be
>     appreciated.
>      >
>      >
>      > Sincerely,
>      >
>      > Stefan
>      >
>      > \definefontalternative[md]
>      >
>      > \definefontalternative[mi]
>      >
>      >
>      > \starttypescript [serif] [custodia]
>      >
>      > \definefontsynonym[Serif] [name:custodianormal][features=default]
>      >
>      > \definefontsynonym[SerifItalic]
>      > [name:custodianormalitalic][features=default]
>      >
>      > \definefontsynonym[SerifMedium]
>     [name:custodiasemibold][features=default]
>      >
>      > \definefontsynonym[SerifMediumItalic]
>      > [name:custodiasemibolditalic][features=default]
>      >
>      > \definefontsynonym[SerifBold] [name:custodiabold][features=default]
>      >
>      > \definefontsynonym[SerifBoldItalic]
>      > [name:custodiabolditalic][features=default]
>      >
>      > \stoptypescript
>      >
>      >
>      > \starttypescript [serif] [custodia]
>      >
>      > \definebodyfont [default] [rm]
>      >
>      > [
>      >
>      > tf=Serif sa 1,
>      >
>      > it=SerifItalic sa 1,
>      >
>      > md=SerifMedium sa 1,
>      >
>      > mi=SerifMediumItalic sa 1,
>      >
>      > bf=SerifBold sa 1,
>      >
>      > bi=SerifBoldItalic sa 1]
>      >
>      > \stoptypescript
>      >
>      >
>      >
>      > \definetypeface [custodia] [rm] [serif] [custodia] [default]
>      >
>      >
>      >
>      >
>      >
>      > \usetypescript[custodia][uc]
>      >
>      > \setupbodyfont[custodia,rm,10pt]
>      >
>      >
>      > \starttext
>      >
>      >
>      > Regular Hamburgerfons,
>      >
>      > {\it Italic Hamburgerfons},
>      >
>      > {\md Medium Hamburgerfons},
>      >
>      > {\mi Medium Italic Hamburgerfons},
>      >
>      > {\bf Bold Hamburgerfons},
>      >
>      > {\bi Bold Italic Hamburgerfons},\\
>      >
>      >
>      > \setff{smallcaps}{Small Caps Hamburgerfons},
>      >
>      > \setff{smallcaps}{\it Small Caps Italic Hamburgerfons},
>      >
>      > \setff{smallcaps}{\md Small Caps Medium Hamburgerfons},
>      >
>      > \setff{smallcaps}{\mi Small Caps Medium Italic Hamburgerfons},
>      >
>      > \setff{smallcaps}{\bf Small Caps Bold Hamburgerfons},
>      >
>      > \setff{smallcaps}{\bi Small Caps Bold Italic Hamburgerfons}
>      >
>      >
>      > \stoptext
>      >
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