Velocity Input/Output
Here is where you can where you can adjust how the entire layer responds to your playing.
Want everything loud on pretty much every hit? Then drag the middle node up and to the left:
Want this layer to completely ignore all of the quiet hits? Then drag the left-low node up and to the right:
A velocity I/O panel exists on every Module and Controller, so it often would be overkill to use it all the way up here at the layer-level, but sometimes you do want the entire layer to respond in a certain way -- you do you.