Special police for metric conversion

Some months ago, “pianoleo” (a member) gave me the link to a police that allowed me to write metric conversions like “quaver of a quintolet = semi-quaver from a triolet”. I can’t find the procedure again and would be very thankful to whom who could give me the path to be followed for.

Dan Kreider recommended the Metrico font in a previous thread of yours, here: Tempo equations

More recently Dan Kreider’s developed the MusGlyphs font, which does the same thing as Metrico and plenty more. See MusGlyphs - Notation Central

Thank you very much, indeed!

françois BOHY