Earlier my question was 'what if I want to add an extra sans serif typeface?' (you can see below that I already have one ss - dax, but I need to add ITCAvantGarde as well as part of mainface or in some other way??).

I would like to add to that question, since it is closely connected. This time, realizing I needed to also use small caps, and because AlegreyaSC of various weights is available in my system, you can see how I thought I would need to add it into the definitions below - in the second line.

Then in the body of the document where I needed small caps, I did as follows:

{\sc The text I need in small caps} and the rest of the paragraph follows...

But the result is that the entire document is now in small caps. Clearly I am doing something wrong.

\definefontfamily [mainface] [rm] [alegreya]
\definefontfamily [mainface] [sc] [alegreyasc][[tf=file:alegreyasc-regular]]
\definefontfamily [mainface] [ss] [dax][tf=file:dax-regular]
\definefontfamily [mainface] [mm] [alegreya]
\setupbodyfont[mainface]

Anyone able to help me with this please?

Julian