Correct me if I’m wrong but one respect in which it seems that the Expression Maps in Dorico differ from the Sib. soundsets is the concept in the latter of simply switching off an articulation with a minus sign. This means that in the Sib. soundset, you can for instance switch off mute without replacing it with something else and everything works OK there (after I corrected a significant error in the VSL supplied soundset). In Dorico you have to stop it doing something by telling it to do something else. Now this is not an issue in simpler instruments but if you, say, want to change a detache within a mute to ord, this would normally kick you out of mute altogether rather than just change the articulation while retaining the mute. This can be done by repeating the con sord (and hiding it in the score) together with ord. In a test piece everything works fine until after the con sord where I still get one or two oddities I’m so far at a loss to explain.
Anyone with considerable experience in creating Dorico Expression maps like to give a few dos and don’ts for this kind of situation, particular regarding mutual exclusion groups which don’t always do what I’d expect? I must say that before I embarked on this venture, I’ve found creating your own EM in Dorico easier than expected with good reliability but still have a lot to learn
UPDATE seem to have ironed out the difficulties and am well underway with adding the player configurations. I’m guessing there are no shortcuts here.