Layer vs Zone

Kind thanks sir.

The last line is exactly what I was wanting to hear.
It is what I thought it was, layers are not so much like Photoshop layers, but rather Photoshop layer ‘folders’ which house layers and allow me to group process/activate/move individual layers. Difference is that of course we do not have to stack the folders, we can have 2 equal level folders side by side to group zones in the same hierarchy.

I was confused with concern to velocity, but I get that they are still layers of zones within a layer… actually they do not have to be used as level velocity but any change affected by midi velocity input … which again clears up the idea of stacking sample zones.

Many thanks.