This is not a conversion tutorial as such, but an insight on how I proceeded to convert my Axe-Fx III presets to FM3 format. Loading a Axe-Fx III preset directly into the FM3 wouldn't work for me and my complex presets, so the initial work has to be done with Axe-Fx III edit : making everything fit in a 4x12 grid, and compensating for the fact that the FM3 has only 1 Amp/1 Cab etc., and much less CPU available. The original Axe-Fx III versions are quite complex, so I had to find a way to do it... I recorded the conversion procedure in real time, removed some parts to shorten the video (and remove horrible clams in my playing), so here it is ! My apologies, I'm not explaining everything, so some attention will be needed to understand the reason behind some of the tweaks.
I have way over 500 presets to convert, this is going to take some time