I'm trying to implement two opentype features that change the spacing of the font. ss01 makes letter-spacing wide (for small text sizes) ss02 makes it tight (for headlines). The problem is that for each of the features to work properly the other feature has to be disabled or else the incremented values of ss02 will add to the values of ss01, if the user has enabled both.
It would be great if ss02 just disabled ss01, when both are selected. Is there a way to do this?