Curve brushes wont use zsub [Answered]

[system]

Hey guys,

I am trying to use one of the curve brushes to cut a hole in my mesh. I am using Dynamesh and I have tried using CurveLineTube, Curve MultiTube, etc. and all of them will add geometry instead of subtracting, even when the brush is in zsub mode. What am I doing wrong?

[marcus_civis]

Hold Alt when you draw the curve.

[system]

Yeah, I knew I was making some kind of amateur mistake like that. Thanks!