It's an old knowledge that in Krita 3 some brushes behave differently from 2.9

For instance, random rotation offsets from Fuzzy sensor are scaled by the curve from Pressure sensor in 2.9 and in 3 all the values from curves are added (this negates usefulness of multiple sensors).



Overall, how curves from different sensors combine is not communicated to user anywhere in the interface and must be discovered by experimentation - giant time sink.

I propose to let the user select how each curve will affect resulting value.

1. Add
2. Scale
3. Limit from Above
4. Limit from Below

It would tie up in something like this:

max(min(((a1 + ... an) * s1 * ... sn), la1, ... lan), lb1, ... lbn)

Also it would be cool to measure rotaion in tau. That way range [0, 1] would be one full rotation counter clockwise. Which is consistent with ranges of other dynamics.