Thanks for your reply.
I did indeed check the brushes out you marked with tilt, but the effect is not as organic as in the other apps I mentioned. The effect seems rather on/off, and not very gradual. I can set size to tilt, but I can find no other way to control the effect, for instance by a curve. If you check the notes pencil for instance, you can get a narrow line, a thicker line, and also a larger shading effect. So far I have not been able to replicate this effect in ASP. Perhaps I am overlooking some options? I basically would want a range from the normal mark of the "pencil crayon" (for example) to the tilted rage of the "shading tilt". I am not sure if this can be done right now?