for fine faders (whether dot or bar) level basically specifies how many distinct values you want that fader to have, regardless of its size. so you could have a fader which is 8 buttons wide but has 50 levels, for instance. the inc/dec buttons (which only fine faders have) always increment or decrement by 1.
you can’t assign just any number of levels, however, since varibright grids only allow 16 different brightness levels. so the maximum allowed value will be the width (or height) - 2 (2 buttons are always reserved for inc/dec) multiplied by 16 (and we need to subtract one since this is the max value, and the full range is 0…max).
basically, the idea is that you can only define levels that can be displayed with different brightness levels. you don’t have to remember the above formula, if in doubt just set it to some large number and it’ll limit it automatically for you (as a matter of fact, a good way to check what’s the maximum value is for a given fader is create it with some large number and then use G.FDR.L x to check what it is).
when you use G.BTN.N it will return a value in the 0…max range. G.BTN.V gives you that scaled to whatever the current range is for that group.
when i start on the grid studies again i’ll start with the one on faders 