I was currently in the process of getting a small regulator for my daughter and encountered the Genesis Origin line of regs with 2nds that are similar to the US Divers Micra reg.
What piqued my curiosity though was the 1st stage. From the outside, it looks like a typical flow-by piston reg, but on further reading, they were either the unbalanced GF100 vs the balanced GF200. The only difference it seemed was the kind of orifice used.
(Pic from manuals from the site)
Without having received the reg yet to take it apart, I was wondering what the differences in the orifice were that shifted it from unbalanced to balanced.