What does the on mouse wheel block dz equals?

Arcade Help
1

For

image
image317×161 9.56 KB
This block, what does the dz equal?

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2

I think it’s for zooming in/out, like using two fingers on a trackpad. This doesn’t seem to work on my Mac though, so it’s either broken or only works on certain devices like maybe iPads or something?

3

Ok. I’ll check it out.