Velocity sensitive buttons or pads? New to livid, have a dream.

So I don't think I'm looking for much, I just want to create a midi controller with velocity sensitive pads or buttons. Is there something specific I should be looking for?

I think the brain v2 looks like the right brain for the project (I want more than 16 buttons) but how to do I begin integrating velocity sensitivity into a creation? omni board? a special sort of button?

I want to create a hexagrid controller (been done I know but I think every company who's done it is out of business)