The next section is really interesting. Colour Dynamics allow you to change the way colours work in your brush. To see this effect I have set the brush colour to red.
(Before colour Dynamics)
Hue jitter does just that, it varies the hue of the brush along the stroke. So when this is set low you will see a range of colours from yellows to reds, but if set to 100% you will see a whole range of colours from all hues.
Saturation jitter varies the saturation of the brush. So some spots of colour will be desaturated while others will be bright and vivid.
Brightness jitter is also self explanatory. Some spots darker, other lighter.
The image below shows the jitters independently:
No colour dynamics
Under the transfer section is opacity jitter, which simple varies the opacity of the colour tips occasionally letting colours beneath the stroke through.
Brush flow controls the transparency of overlapping parts of the brush. When flow jitter is set higher, overlapping parts of the stroke get lighter as the flow on those areas is lower.
Finally, there are some more settings that can only be turned on and off. These are noise, wet edges, smoothing and protect texture. The effects of these can be instantly and easily seen by turning them on. Wet edges provides a watercolour feel while noise breaks up the brush stroke with noise-like texture. (like applying gaussian blur to the stroke)
The image above shows the last stroke with both noise and wet edges applied.
The best thing you can do is to play around with the settings and see what interesting effects you can get. Then, when you are in the middle of a piece of work and think “oh, I need a brush like this,” it will be much easier to modify existing ones to create the perfect brush.