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		I love the ink tool (the calligraphy pen): a slow movement is a thick like, and a fast movement is thin, just like using a quill pen. But for drawing I need the opposite: when quickly drawing a person's arm I need a thick line, but when I slow down to draw the fingers I need it thinner. Is there some way to do that? 
(Using Gimp 2.8.16 on Linux Mint)
	
	
	
	
		
	
 
 
	
	
	
		
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		You can't change the standard  brushes, you have to make a copy (and for the "parametric" brushes you can just create a new one).
	
	
	
	
		
	
 
 
	
	
	
		
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		That's perfect! Thanks! 
For any other noobs like me, this is how you create a new dynamic:
Select a brush tool. -> find the "dynamics" field -> click the big blue arrow -> at the bottom of the list dialog, click ANOTHER big blue arrow -> at the top is is a tiny arrow fo the configure menu. This lets you duplicate a dynamic. You can then edit the new one. Phew!