I’ve been playing with the app, no model, just looking at the tracking of the app directly on my iPhone, and it’s really hard to make the tracker detect Mouth Smile in the negatives, so the frown shapes. Furthermore, it’s basically imposible to make the mouth open shapes that should go with the negative ones of the mouth smile, as soon as I open the mouth the mouth smile goes above 0… I’ve tried playing a lot with the settings, making the bottom higher and the top lower but I just can’t reach those combinations … trying to do the O and U shape seems impossible…