Novus weapon upgrade system findings

[Ecks007]

From what I've heard it works in tiers. Once you put in enough 1s, you head to 2s, then 3s and 4s. If someone else could elaborate and/or correct me if I'm wrong I'm curious as well.

Well I thought so, or do you mean I need to put in more 1s but for my other stats that I want in there before 2s slots are available?

I was under the impression it would work at 1 type of materia at a time.