So it is not a brush, or it would be if I put pressure on Shape dynamics/size jitter and i try fade on Color dynamics f/b jitter or Other dynamics. And quite a big hit is to use an airbrush stylus and have size jitter on the wheel but is hard to get used to it. It will get closer to the fountain brushes, and we have to tweak the texture for that kind of a very dry brush.
It is not a pencil, or it would be if I put some texture and manage to tweak the opacity jitter with the pressure.
It is not a classical writing pen. And here I have tried to build a custom brush tip, made of two dots that are close together and as pressure is increasing the dots are moving further from each other. (As I remember I used the dual brush for this). But still it looks digital, the dots are all the time moving away in the same manner, they do not let more or less ink depending on the overall ink level found on the pen.
It is close to a marker when used with the art stylus. But just that, a marker. And also the Angle jitter and rotation work but do not update the angle of the pointer (for me).
I guess the most easy to replicate is the airbrush. Size on pressure and flow on wheel. Opacity is controlled by the numbers in the keypad.
As you can see I’m not pretty happy with my wacom. Also I cannot clearly find a logical way to use tilt.