The smoothing option works with vector brushes. However, it does not work with pixel brushes (0 and 100% smoothening look the same). Why then have the smoothing option with pixel brushes? I am using Fresco on the iPad Pro 3rd generation with the new Apple Pencil.
I've been doing some testing with the pixel brushes and I'm definitely seeing a difference in the strokes when I use smoothing. But, I haven't tried it with all the brushes and I lean toward the Marker, Lettering, and Basic brushes (I even tried it with a few of Kyle's brushes.)
Let me know which brushes you're using and I can test those.
thanks for taking the time out to test and reply. I tried it again myself. The vector brushes show a dramatic difference between smoothing set to 0% and 100%. Try using fast wavy strokes. I was expecting the same with the pixel brushes. However, I now realise smoothing is working with the pixel brushes, but the effect is very minor - try again using fast wavy strokes. Do you find the same. BTW I am using the free version of Fresco available to me through my photography subscription.