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How to use the pen mask to erase masking with? (answered)

ZBrush Usage Questions
#1

How to use the pen mask to erase masking with?
Is there a vid tut or tut on how to use the pen masking as an eraser?
Thanks

I did a search and have not found anything and I read the Pixologic ZBrush 4 wiki about masking and masking tools and found nothing.

#2

OK found it Ctrl + Alt acts as an eraser.

#3

You will find that Alt is consistently the method by which you can reverse the effect of a brush. It will change Mask to UnMask, Select to Hide Selection, Smooth to Sharpen, Zadd to Zsub, etc.

Enjoy!