Here is an excellent way to learn about the brush settings that you don't understand.
First of all you must realise that all the custom brushes are only saved settings in the brush controls pallette. Try this, select any custom brush. very carefully go through every field on the brush controls pallette and with an analogue carbon based writing instrument record every setting. Note some fields will be irrelevent. Then select another brush, then change the settings one by one in the field till it matches what you wrote down. After each field change try your brush to see how it's changing. When all the settings are the same you will see that you have changed your second brush into your first brush. Click restore default. This exercise can yield some enlightening observations. For example when all the settings are nearly the same you might find it hard to believe that you will end up with the same brush, then suddenly you make a small change like on the feature setting then presto there's your brush. If your second brush does not look exactly like your first then you have missed something in one of the fields, it could be very subtle like an invers setting check box in the expression field. This insight that all custom brushes are merely saved settings was a quantum leap in my painter learning curve.
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