It’s a new feature which will work with the next beta.20. April 2016 um 16:03Wolfgang,
Use separate threads for each problem. The uppercase sharp s replacement with \WORD can be changed in the next beta.are you saying, use this example as long as the new beta isn't out yet, or are you saying, this example will work as soon as I'll use the new beta? It doesn't seem to do anything right now, not even an error message.
%% begin example
The output of \sc to produce small capitals depends on the font and it’s the font designers job to provide a small ẞ (he could use stilistic sets to let you choose between ß and ẞ).I was looking for a general way how to substitute one glyph with another depending on context, thus I can't see how there are different problems in my post? But it's good to hear that others have thought at least of a partial solution.
Is my guess right that normally the author of a font ought to provide otf features that can be switched on and off to get one result instead of the other? That area seems to be utter chaos in the Calluna fonts.