I prefer not to smooth too much. I’m still unexperienced in ZB, and Ryan Kingslien with his great tut on his sandpaper brush gave me the desire to experiment as I wanted a smoother step, so here’s what I do:
I open the alpha pallette on the left and the brush pallette on the right
I take the standard smooth brush and add alpha 24
in the brush pallette I set the brushmod to -26
in the alpha pallette I give the curve a bit of a curved slope
with the curve and the U (z intensity) and S (brushsize) shortcuts, I tweak the brush for more or less detail.
A small brush size and a low z-intensity can work like very fine sandpaper. And just like with very smooth sandpaper, you have to rub the surface several times to get a more visible result.
The simply save the brush from the brush panel, and it’ll always be available.